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llvm/test/Transforms/InstCombine/select.ll
Sanjay Patel 16c5e12d3a [InstCombine] if the condition of a select may be known via assumes, eliminate the select 
This is a limited solution for PR31512:
https://llvm.org/bugs/show_bug.cgi?id=31512

The motivation is that we will need to increase usage of llvm.assume and/or metadata to solve PR28430:
https://llvm.org/bugs/show_bug.cgi?id=28430

...and this kind of simplification is needed to take advantage of that extra information.

The 'not' test case would be handled by:
https://reviews.llvm.org/D28485

Differential Revision:
https://reviews.llvm.org/D28337


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291915 91177308-0d34-0410-b5e6-96231b3b80d8
2017-01-13 17:02:42 +00:00

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; RUN: opt < %s -instcombine -S | FileCheck %s
; PR1822
target datalayout = "e-p:64:64-p1:16:16-p2:32:32:32-p3:64:64:64"
define i32 @test1(i32 %A, i32 %B) {
%C = select i1 false, i32 %A, i32 %B
ret i32 %C
; CHECK-LABEL: @test1(
; CHECK: ret i32 %B
}
define i32 @test2(i32 %A, i32 %B) {
%C = select i1 true, i32 %A, i32 %B
ret i32 %C
; CHECK-LABEL: @test2(
; CHECK: ret i32 %A
}
define i32 @test3(i1 %C, i32 %I) {
; V = I
%V = select i1 %C, i32 %I, i32 %I
ret i32 %V
; CHECK-LABEL: @test3(
; CHECK: ret i32 %I
}
define i1 @test4(i1 %C) {
; V = C
%V = select i1 %C, i1 true, i1 false
ret i1 %V
; CHECK-LABEL: @test4(
; CHECK: ret i1 %C
}
define i1 @test5(i1 %C) {
; V = !C
%V = select i1 %C, i1 false, i1 true
ret i1 %V
; CHECK-LABEL: @test5(
; CHECK: xor i1 %C, true
; CHECK: ret i1
}
define i32 @test6(i1 %C) {
; V = cast C to int
%V = select i1 %C, i32 1, i32 0
ret i32 %V
; CHECK-LABEL: @test6(
; CHECK: %V = zext i1 %C to i32
; CHECK: ret i32 %V
}
define i1 @test7(i1 %C, i1 %X) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: [[R:%.*]] = or i1 %C, %X
; CHECK-NEXT: ret i1 [[R]]
;
%R = select i1 %C, i1 true, i1 %X
ret i1 %R
}
define <2 x i1> @test7vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test7vec(
; CHECK-NEXT: [[R:%.*]] = or <2 x i1> %C, %X
; CHECK-NEXT: ret <2 x i1> [[R]]
;
%R = select <2 x i1> %C, <2 x i1> <i1 true, i1 true>, <2 x i1> %X
ret <2 x i1> %R
}
define i1 @test8(i1 %C, i1 %X) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: [[R:%.*]] = and i1 %C, %X
; CHECK-NEXT: ret i1 [[R]]
;
%R = select i1 %C, i1 %X, i1 false
ret i1 %R
}
define <2 x i1> @test8vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test8vec(
; CHECK-NEXT: [[R:%.*]] = and <2 x i1> %C, %X
; CHECK-NEXT: ret <2 x i1> [[R]]
;
%R = select <2 x i1> %C, <2 x i1> %X, <2 x i1> <i1 false, i1 false>
ret <2 x i1> %R
}
define i1 @test9(i1 %C, i1 %X) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: [[NOT_C:%.*]] = xor i1 %C, true
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_C]], %X
; CHECK-NEXT: ret i1 [[R]]
;
%R = select i1 %C, i1 false, i1 %X
ret i1 %R
}
define <2 x i1> @test9vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test9vec(
; CHECK-NEXT: [[NOT_C:%.*]] = xor <2 x i1> %C, <i1 true, i1 true>
; CHECK-NEXT: [[R:%.*]] = and <2 x i1> [[NOT_C]], %X
; CHECK-NEXT: ret <2 x i1> [[R]]
;
%R = select <2 x i1> %C, <2 x i1> <i1 false, i1 false>, <2 x i1> %X
ret <2 x i1> %R
}
define i1 @test10(i1 %C, i1 %X) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[NOT_C:%.*]] = xor i1 %C, true
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_C]], %X
; CHECK-NEXT: ret i1 [[R]]
;
%R = select i1 %C, i1 %X, i1 true
ret i1 %R
}
define <2 x i1> @test10vec(<2 x i1> %C, <2 x i1> %X) {
; CHECK-LABEL: @test10vec(
; CHECK-NEXT: [[NOT_C:%.*]] = xor <2 x i1> %C, <i1 true, i1 true>
; CHECK-NEXT: [[R:%.*]] = or <2 x i1> [[NOT_C]], %X
; CHECK-NEXT: ret <2 x i1> [[R]]
;
%R = select <2 x i1> %C, <2 x i1> %X, <2 x i1> <i1 true, i1 true>
ret <2 x i1> %R
}
define i1 @test23(i1 %a, i1 %b) {
; CHECK-LABEL: @test23(
; CHECK-NEXT: [[C:%.*]] = and i1 %a, %b
; CHECK-NEXT: ret i1 [[C]]
;
%c = select i1 %a, i1 %b, i1 %a
ret i1 %c
}
define <2 x i1> @test23vec(<2 x i1> %a, <2 x i1> %b) {
; CHECK-LABEL: @test23vec(
; CHECK-NEXT: [[C:%.*]] = and <2 x i1> %a, %b
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%c = select <2 x i1> %a, <2 x i1> %b, <2 x i1> %a
ret <2 x i1> %c
}
define i1 @test24(i1 %a, i1 %b) {
; CHECK-LABEL: @test24(
; CHECK-NEXT: [[C:%.*]] = or i1 %a, %b
; CHECK-NEXT: ret i1 [[C]]
;
%c = select i1 %a, i1 %a, i1 %b
ret i1 %c
}
define <2 x i1> @test24vec(<2 x i1> %a, <2 x i1> %b) {
; CHECK-LABEL: @test24vec(
; CHECK-NEXT: [[C:%.*]] = or <2 x i1> %a, %b
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%c = select <2 x i1> %a, <2 x i1> %a, <2 x i1> %b
ret <2 x i1> %c
}
define i1 @test62(i1 %A, i1 %B) {
; CHECK-LABEL: @test62(
; CHECK-NEXT: [[NOT:%.*]] = xor i1 %A, true
; CHECK-NEXT: [[C:%.*]] = and i1 [[NOT]], %B
; CHECK-NEXT: ret i1 [[C]]
;
%not = xor i1 %A, true
%C = select i1 %A, i1 %not, i1 %B
ret i1 %C
}
define <2 x i1> @test62vec(<2 x i1> %A, <2 x i1> %B) {
; CHECK-LABEL: @test62vec(
; CHECK-NEXT: [[NOT:%.*]] = xor <2 x i1> %A, <i1 true, i1 true>
; CHECK-NEXT: [[C:%.*]] = and <2 x i1> [[NOT]], %B
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%not = xor <2 x i1> %A, <i1 true, i1 true>
%C = select <2 x i1> %A, <2 x i1> %not, <2 x i1> %B
ret <2 x i1> %C
}
define i1 @test63(i1 %A, i1 %B) {
; CHECK-LABEL: @test63(
; CHECK-NEXT: [[NOT:%.*]] = xor i1 %A, true
; CHECK-NEXT: [[C:%.*]] = or i1 %B, [[NOT]]
; CHECK-NEXT: ret i1 [[C]]
;
%not = xor i1 %A, true
%C = select i1 %A, i1 %B, i1 %not
ret i1 %C
}
define <2 x i1> @test63vec(<2 x i1> %A, <2 x i1> %B) {
; CHECK-LABEL: @test63vec(
; CHECK-NEXT: [[NOT:%.*]] = xor <2 x i1> %A, <i1 true, i1 true>
; CHECK-NEXT: [[C:%.*]] = or <2 x i1> %B, [[NOT]]
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%not = xor <2 x i1> %A, <i1 true, i1 true>
%C = select <2 x i1> %A, <2 x i1> %B, <2 x i1> %not
ret <2 x i1> %C
}
define i32 @test11(i32 %a) {
%C = icmp eq i32 %a, 0
%R = select i1 %C, i32 0, i32 1
ret i32 %R
; CHECK-LABEL: @test11(
; CHECK: icmp ne i32 %a, 0
; CHECK: %R = zext i1
; CHECK: ret i32 %R
}
define i32 @test12(i1 %cond, i32 %a) {
%b = or i32 %a, 1
%c = select i1 %cond, i32 %b, i32 %a
ret i32 %c
; CHECK-LABEL: @test12(
; CHECK: %b = zext i1 %cond to i32
; CHECK: %c = or i32 %b, %a
; CHECK: ret i32 %c
}
define i32 @test12a(i1 %cond, i32 %a) {
%b = ashr i32 %a, 1
%c = select i1 %cond, i32 %b, i32 %a
ret i32 %c
; CHECK-LABEL: @test12a(
; CHECK: %b = zext i1 %cond to i32
; CHECK: %c = ashr i32 %a, %b
; CHECK: ret i32 %c
}
define i32 @test12b(i1 %cond, i32 %a) {
; CHECK-LABEL: @test12b(
; CHECK-NEXT: [[NOT_COND:%.*]] = xor i1 %cond, true
; CHECK-NEXT: [[B:%.*]] = zext i1 [[NOT_COND]] to i32
; CHECK-NEXT: [[D:%.*]] = ashr i32 %a, [[B]]
; CHECK-NEXT: ret i32 [[D]]
;
%b = ashr i32 %a, 1
%d = select i1 %cond, i32 %a, i32 %b
ret i32 %d
}
define i32 @test13(i32 %a, i32 %b) {
%C = icmp eq i32 %a, %b
%V = select i1 %C, i32 %a, i32 %b
ret i32 %V
; CHECK-LABEL: @test13(
; CHECK: ret i32 %b
}
define i32 @test13a(i32 %a, i32 %b) {
%C = icmp ne i32 %a, %b
%V = select i1 %C, i32 %a, i32 %b
ret i32 %V
; CHECK-LABEL: @test13a(
; CHECK: ret i32 %a
}
define i32 @test13b(i32 %a, i32 %b) {
%C = icmp eq i32 %a, %b
%V = select i1 %C, i32 %b, i32 %a
ret i32 %V
; CHECK-LABEL: @test13b(
; CHECK: ret i32 %a
}
define i1 @test14a(i1 %C, i32 %X) {
%V = select i1 %C, i32 %X, i32 0
; (X < 1) | !C
%R = icmp slt i32 %V, 1
ret i1 %R
; CHECK-LABEL: @test14a(
; CHECK: icmp slt i32 %X, 1
; CHECK: xor i1 %C, true
; CHECK: or i1
; CHECK: ret i1 %R
}
define i1 @test14b(i1 %C, i32 %X) {
%V = select i1 %C, i32 0, i32 %X
; (X < 1) | C
%R = icmp slt i32 %V, 1
ret i1 %R
; CHECK-LABEL: @test14b(
; CHECK: icmp slt i32 %X, 1
; CHECK: or i1
; CHECK: ret i1 %R
}
;; Code sequence for (X & 16) ? 16 : 0
define i32 @test15a(i32 %X) {
%t1 = and i32 %X, 16
%t2 = icmp eq i32 %t1, 0
%t3 = select i1 %t2, i32 0, i32 16
ret i32 %t3
; CHECK-LABEL: @test15a(
; CHECK: %t1 = and i32 %X, 16
; CHECK: ret i32 %t1
}
;; Code sequence for (X & 32) ? 0 : 24
define i32 @test15b(i32 %X) {
%t1 = and i32 %X, 32
%t2 = icmp eq i32 %t1, 0
%t3 = select i1 %t2, i32 32, i32 0
ret i32 %t3
; CHECK-LABEL: @test15b(
; CHECK: %t1 = and i32 %X, 32
; CHECK: xor i32 %t1, 32
; CHECK: ret i32
}
;; Alternate code sequence for (X & 16) ? 16 : 0
define i32 @test15c(i32 %X) {
%t1 = and i32 %X, 16
%t2 = icmp eq i32 %t1, 16
%t3 = select i1 %t2, i32 16, i32 0
ret i32 %t3
; CHECK-LABEL: @test15c(
; CHECK: %t1 = and i32 %X, 16
; CHECK: ret i32 %t1
}
;; Alternate code sequence for (X & 16) ? 16 : 0
define i32 @test15d(i32 %X) {
%t1 = and i32 %X, 16
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 16, i32 0
ret i32 %t3
; CHECK-LABEL: @test15d(
; CHECK: %t1 = and i32 %X, 16
; CHECK: ret i32 %t1
}
;; (a & 128) ? 256 : 0
define i32 @test15e(i32 %X) {
%t1 = and i32 %X, 128
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 256, i32 0
ret i32 %t3
; CHECK-LABEL: @test15e(
; CHECK: %t1 = shl i32 %X, 1
; CHECK: and i32 %t1, 256
; CHECK: ret i32
}
;; (a & 128) ? 0 : 256
define i32 @test15f(i32 %X) {
%t1 = and i32 %X, 128
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 0, i32 256
ret i32 %t3
; CHECK-LABEL: @test15f(
; CHECK: %t1 = shl i32 %X, 1
; CHECK: and i32 %t1, 256
; CHECK: xor i32 %{{.*}}, 256
; CHECK: ret i32
}
;; (a & 8) ? -1 : -9
define i32 @test15g(i32 %X) {
%t1 = and i32 %X, 8
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 -1, i32 -9
ret i32 %t3
; CHECK-LABEL: @test15g(
; CHECK-NEXT: %1 = or i32 %X, -9
; CHECK-NEXT: ret i32 %1
}
;; (a & 8) ? -9 : -1
define i32 @test15h(i32 %X) {
%t1 = and i32 %X, 8
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 -9, i32 -1
ret i32 %t3
; CHECK-LABEL: @test15h(
; CHECK-NEXT: %1 = or i32 %X, -9
; CHECK-NEXT: %2 = xor i32 %1, 8
; CHECK-NEXT: ret i32 %2
}
;; (a & 2) ? 577 : 1089
define i32 @test15i(i32 %X) {
%t1 = and i32 %X, 2
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 577, i32 1089
ret i32 %t3
; CHECK-LABEL: @test15i(
; CHECK-NEXT: %t1 = shl i32 %X, 8
; CHECK-NEXT: %1 = and i32 %t1, 512
; CHECK-NEXT: %2 = xor i32 %1, 512
; CHECK-NEXT: %3 = add nuw nsw i32 %2, 577
; CHECK-NEXT: ret i32 %3
}
;; (a & 2) ? 1089 : 577
define i32 @test15j(i32 %X) {
%t1 = and i32 %X, 2
%t2 = icmp ne i32 %t1, 0
%t3 = select i1 %t2, i32 1089, i32 577
ret i32 %t3
; CHECK-LABEL: @test15j(
; CHECK-NEXT: %t1 = shl i32 %X, 8
; CHECK-NEXT: %1 = and i32 %t1, 512
; CHECK-NEXT: %2 = add nuw nsw i32 %1, 577
; CHECK-NEXT: ret i32 %2
}
define i32 @test16(i1 %C, i32* %P) {
%P2 = select i1 %C, i32* %P, i32* null
%V = load i32, i32* %P2
ret i32 %V
; CHECK-LABEL: @test16(
; CHECK-NEXT: %V = load i32, i32* %P
; CHECK: ret i32 %V
}
;; It may be legal to load from a null address in a non-zero address space
define i32 @test16_neg(i1 %C, i32 addrspace(1)* %P) {
%P2 = select i1 %C, i32 addrspace(1)* %P, i32 addrspace(1)* null
%V = load i32, i32 addrspace(1)* %P2
ret i32 %V
; CHECK-LABEL: @test16_neg
; CHECK-NEXT: %P2 = select i1 %C, i32 addrspace(1)* %P, i32 addrspace(1)* null
; CHECK-NEXT: %V = load i32, i32 addrspace(1)* %P2
; CHECK: ret i32 %V
}
define i32 @test16_neg2(i1 %C, i32 addrspace(1)* %P) {
%P2 = select i1 %C, i32 addrspace(1)* null, i32 addrspace(1)* %P
%V = load i32, i32 addrspace(1)* %P2
ret i32 %V
; CHECK-LABEL: @test16_neg2
; CHECK-NEXT: %P2 = select i1 %C, i32 addrspace(1)* null, i32 addrspace(1)* %P
; CHECK-NEXT: %V = load i32, i32 addrspace(1)* %P2
; CHECK: ret i32 %V
}
define i1 @test17(i32* %X, i1 %C) {
%R = select i1 %C, i32* %X, i32* null
%RV = icmp eq i32* %R, null
ret i1 %RV
; CHECK-LABEL: @test17(
; CHECK: icmp eq i32* %X, null
; CHECK: xor i1 %C, true
; CHECK: %RV = or i1
; CHECK: ret i1 %RV
}
define i32 @test18(i32 %X, i32 %Y, i1 %C) {
%R = select i1 %C, i32 %X, i32 0
%V = sdiv i32 %Y, %R
ret i32 %V
; CHECK-LABEL: @test18(
; CHECK: %V = sdiv i32 %Y, %X
; CHECK: ret i32 %V
}
define i32 @test19(i32 %x) {
%tmp = icmp ugt i32 %x, 2147483647
%retval = select i1 %tmp, i32 -1, i32 0
ret i32 %retval
; CHECK-LABEL: @test19(
; CHECK-NEXT: ashr i32 %x, 31
; CHECK-NEXT: ret i32
}
define i32 @test20(i32 %x) {
%tmp = icmp slt i32 %x, 0
%retval = select i1 %tmp, i32 -1, i32 0
ret i32 %retval
; CHECK-LABEL: @test20(
; CHECK-NEXT: ashr i32 %x, 31
; CHECK-NEXT: ret i32
}
define i64 @test21(i32 %x) {
%tmp = icmp slt i32 %x, 0
%retval = select i1 %tmp, i64 -1, i64 0
ret i64 %retval
; CHECK-LABEL: @test21(
; CHECK-NEXT: ashr i32 %x, 31
; CHECK-NEXT: sext i32
; CHECK-NEXT: ret i64
}
define i16 @test22(i32 %x) {
%tmp = icmp slt i32 %x, 0
%retval = select i1 %tmp, i16 -1, i16 0
ret i16 %retval
; CHECK-LABEL: @test22(
; CHECK-NEXT: ashr i32 %x, 31
; CHECK-NEXT: trunc i32
; CHECK-NEXT: ret i16
}
define i32 @test25(i1 %c) {
entry:
br i1 %c, label %jump, label %ret
jump:
br label %ret
ret:
%a = phi i1 [true, %jump], [false, %entry]
%b = select i1 %a, i32 10, i32 20
ret i32 %b
; CHECK-LABEL: @test25(
; CHECK: %a = phi i32 [ 10, %jump ], [ 20, %entry ]
; CHECK-NEXT: ret i32 %a
}
define i32 @test26(i1 %cond) {
entry:
br i1 %cond, label %jump, label %ret
jump:
%c = or i1 false, false
br label %ret
ret:
%a = phi i1 [true, %entry], [%c, %jump]
%b = select i1 %a, i32 20, i32 10
ret i32 %b
; CHECK-LABEL: @test26(
; CHECK: %a = phi i32 [ 20, %entry ], [ 10, %jump ]
; CHECK-NEXT: ret i32 %a
}
define i32 @test27(i1 %c, i32 %A, i32 %B) {
entry:
br i1 %c, label %jump, label %ret
jump:
br label %ret
ret:
%a = phi i1 [true, %jump], [false, %entry]
%b = select i1 %a, i32 %A, i32 %B
ret i32 %b
; CHECK-LABEL: @test27(
; CHECK: %a = phi i32 [ %A, %jump ], [ %B, %entry ]
; CHECK-NEXT: ret i32 %a
}
define i32 @test28(i1 %cond, i32 %A, i32 %B) {
entry:
br i1 %cond, label %jump, label %ret
jump:
br label %ret
ret:
%c = phi i32 [%A, %jump], [%B, %entry]
%a = phi i1 [true, %jump], [false, %entry]
%b = select i1 %a, i32 %A, i32 %c
ret i32 %b
; CHECK-LABEL: @test28(
; CHECK: %a = phi i32 [ %A, %jump ], [ %B, %entry ]
; CHECK-NEXT: ret i32 %a
}
define i32 @test29(i1 %cond, i32 %A, i32 %B) {
entry:
br i1 %cond, label %jump, label %ret
jump:
br label %ret
ret:
%c = phi i32 [%A, %jump], [%B, %entry]
%a = phi i1 [true, %jump], [false, %entry]
br label %next
next:
%b = select i1 %a, i32 %A, i32 %c
ret i32 %b
; CHECK-LABEL: @test29(
; CHECK: %a = phi i32 [ %A, %jump ], [ %B, %entry ]
; CHECK: ret i32 %a
}
; SMAX(SMAX(x, y), x) -> SMAX(x, y)
define i32 @test30(i32 %x, i32 %y) {
%cmp = icmp sgt i32 %x, %y
%cond = select i1 %cmp, i32 %x, i32 %y
%cmp5 = icmp sgt i32 %cond, %x
%retval = select i1 %cmp5, i32 %cond, i32 %x
ret i32 %retval
; CHECK-LABEL: @test30(
; CHECK: ret i32 %cond
}
; UMAX(UMAX(x, y), x) -> UMAX(x, y)
define i32 @test31(i32 %x, i32 %y) {
%cmp = icmp ugt i32 %x, %y
%cond = select i1 %cmp, i32 %x, i32 %y
%cmp5 = icmp ugt i32 %cond, %x
%retval = select i1 %cmp5, i32 %cond, i32 %x
ret i32 %retval
; CHECK-LABEL: @test31(
; CHECK: ret i32 %cond
}
; SMIN(SMIN(x, y), x) -> SMIN(x, y)
define i32 @test32(i32 %x, i32 %y) {
%cmp = icmp sgt i32 %x, %y
%cond = select i1 %cmp, i32 %y, i32 %x
%cmp5 = icmp sgt i32 %cond, %x
%retval = select i1 %cmp5, i32 %x, i32 %cond
ret i32 %retval
; CHECK-LABEL: @test32(
; CHECK: ret i32 %cond
}
; MAX(MIN(x, y), x) -> x
define i32 @test33(i32 %x, i32 %y) {
%cmp = icmp sgt i32 %x, %y
%cond = select i1 %cmp, i32 %y, i32 %x
%cmp5 = icmp sgt i32 %cond, %x
%retval = select i1 %cmp5, i32 %cond, i32 %x
ret i32 %retval
; CHECK-LABEL: @test33(
; CHECK: ret i32 %x
}
; MIN(MAX(x, y), x) -> x
define i32 @test34(i32 %x, i32 %y) {
%cmp = icmp sgt i32 %x, %y
%cond = select i1 %cmp, i32 %x, i32 %y
%cmp5 = icmp sgt i32 %cond, %x
%retval = select i1 %cmp5, i32 %x, i32 %cond
ret i32 %retval
; CHECK-LABEL: @test34(
; CHECK: ret i32 %x
}
define i32 @test35(i32 %x) {
%cmp = icmp sge i32 %x, 0
%cond = select i1 %cmp, i32 60, i32 100
ret i32 %cond
; CHECK-LABEL: @test35(
; CHECK: ashr i32 %x, 31
; CHECK: and i32 {{.*}}, 40
; CHECK: add nuw nsw i32 {{.*}}, 60
; CHECK: ret
}
define i32 @test36(i32 %x) {
%cmp = icmp slt i32 %x, 0
%cond = select i1 %cmp, i32 60, i32 100
ret i32 %cond
; CHECK-LABEL: @test36(
; CHECK: ashr i32 %x, 31
; CHECK: and i32 {{.*}}, -40
; CHECK: add nsw i32 {{.*}}, 100
; CHECK: ret
}
define i32 @test37(i32 %x) {
%cmp = icmp sgt i32 %x, -1
%cond = select i1 %cmp, i32 1, i32 -1
ret i32 %cond
; CHECK-LABEL: @test37(
; CHECK: ashr i32 %x, 31
; CHECK: or i32 {{.*}}, 1
; CHECK: ret
}
define i1 @test38(i1 %cond) {
%zero = alloca i32
%one = alloca i32
%ptr = select i1 %cond, i32* %zero, i32* %one
%isnull = icmp eq i32* %ptr, null
ret i1 %isnull
; CHECK-LABEL: @test38(
; CHECK: ret i1 false
}
define i1 @test39(i1 %cond, double %x) {
%s = select i1 %cond, double %x, double 0x7FF0000000000000 ; RHS = +infty
%cmp = fcmp ule double %x, %s
ret i1 %cmp
; CHECK-LABEL: @test39(
; CHECK: ret i1 true
}
define i1 @test40(i1 %cond) {
%a = alloca i32
%b = alloca i32
%c = alloca i32
%s = select i1 %cond, i32* %a, i32* %b
%r = icmp eq i32* %s, %c
ret i1 %r
; CHECK-LABEL: @test40(
; CHECK: ret i1 false
}
define i32 @test41(i1 %cond, i32 %x, i32 %y) {
%z = and i32 %x, %y
%s = select i1 %cond, i32 %y, i32 %z
%r = and i32 %x, %s
ret i32 %r
; CHECK-LABEL: @test41(
; CHECK-NEXT: and i32 %x, %y
; CHECK-NEXT: ret i32
}
define i32 @test42(i32 %x, i32 %y) {
%b = add i32 %y, -1
%cond = icmp eq i32 %x, 0
%c = select i1 %cond, i32 %b, i32 %y
ret i32 %c
; CHECK-LABEL: @test42(
; CHECK-NEXT: %cond = icmp eq i32 %x, 0
; CHECK-NEXT: %b = sext i1 %cond to i32
; CHECK-NEXT: %c = add i32 %b, %y
; CHECK-NEXT: ret i32 %c
}
; PR8994
; This select instruction can't be eliminated because trying to do so would
; change the number of vector elements. This used to assert.
define i48 @test51(<3 x i1> %icmp, <3 x i16> %tmp) {
; CHECK-LABEL: @test51(
%select = select <3 x i1> %icmp, <3 x i16> zeroinitializer, <3 x i16> %tmp
; CHECK: select <3 x i1>
%tmp2 = bitcast <3 x i16> %select to i48
ret i48 %tmp2
}
; Allow select promotion even if there are multiple uses of bitcasted ops.
; Hoisting the selects allows later pattern matching to see that these are min/max ops.
define void @min_max_bitcast(<4 x float> %a, <4 x float> %b, <4 x i32>* %ptr1, <4 x i32>* %ptr2) {
; CHECK-LABEL: @min_max_bitcast(
; CHECK-NEXT: [[CMP:%.*]] = fcmp olt <4 x float> %a, %b
; CHECK-NEXT: [[SEL1_V:%.*]] = select <4 x i1> [[CMP]], <4 x float> %a, <4 x float> %b
; CHECK-NEXT: [[SEL2_V:%.*]] = select <4 x i1> [[CMP]], <4 x float> %b, <4 x float> %a
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x i32>* %ptr1 to <4 x float>*
; CHECK-NEXT: store <4 x float> [[SEL1_V]], <4 x float>* [[TMP1]], align 16
; CHECK-NEXT: [[TMP2:%.*]] = bitcast <4 x i32>* %ptr2 to <4 x float>*
; CHECK-NEXT: store <4 x float> [[SEL2_V]], <4 x float>* [[TMP2]], align 16
; CHECK-NEXT: ret void
;
%cmp = fcmp olt <4 x float> %a, %b
%bc1 = bitcast <4 x float> %a to <4 x i32>
%bc2 = bitcast <4 x float> %b to <4 x i32>
%sel1 = select <4 x i1> %cmp, <4 x i32> %bc1, <4 x i32> %bc2
%sel2 = select <4 x i1> %cmp, <4 x i32> %bc2, <4 x i32> %bc1
store <4 x i32> %sel1, <4 x i32>* %ptr1
store <4 x i32> %sel2, <4 x i32>* %ptr2
ret void
}
; To avoid potential backend problems, we don't do the same transform for other casts.
define void @truncs_before_selects(<4 x float> %f1, <4 x float> %f2, <4 x i64> %a, <4 x i64> %b, <4 x i32>* %ptr1, <4 x i32>* %ptr2) {
; CHECK-LABEL: @truncs_before_selects(
; CHECK-NEXT: [[CMP:%.*]] = fcmp olt <4 x float> %f1, %f2
; CHECK-NEXT: [[BC1:%.*]] = trunc <4 x i64> %a to <4 x i32>
; CHECK-NEXT: [[BC2:%.*]] = trunc <4 x i64> %b to <4 x i32>
; CHECK-NEXT: [[SEL1:%.*]] = select <4 x i1> [[CMP]], <4 x i32> [[BC1]], <4 x i32> [[BC2]]
; CHECK-NEXT: [[SEL2:%.*]] = select <4 x i1> [[CMP]], <4 x i32> [[BC2]], <4 x i32> [[BC1]]
; CHECK-NEXT: store <4 x i32> [[SEL1]], <4 x i32>* %ptr1, align 16
; CHECK-NEXT: store <4 x i32> [[SEL2]], <4 x i32>* %ptr2, align 16
; CHECK-NEXT: ret void
;
%cmp = fcmp olt <4 x float> %f1, %f2
%bc1 = trunc <4 x i64> %a to <4 x i32>
%bc2 = trunc <4 x i64> %b to <4 x i32>
%sel1 = select <4 x i1> %cmp, <4 x i32> %bc1, <4 x i32> %bc2
%sel2 = select <4 x i1> %cmp, <4 x i32> %bc2, <4 x i32> %bc1
store <4 x i32> %sel1, <4 x i32>* %ptr1, align 16
store <4 x i32> %sel2, <4 x i32>* %ptr2, align 16
ret void
}
; PR8575
define i32 @test52(i32 %n, i32 %m) nounwind {
; CHECK-LABEL: @test52(
%cmp = icmp sgt i32 %n, %m
%. = select i1 %cmp, i32 1, i32 3
%add = add nsw i32 %., 3
%storemerge = select i1 %cmp, i32 %., i32 %add
; CHECK: select i1 %cmp, i32 1, i32 6
ret i32 %storemerge
}
; PR9454
define i32 @test53(i32 %x) nounwind {
%and = and i32 %x, 2
%cmp = icmp eq i32 %and, %x
%sel = select i1 %cmp, i32 2, i32 1
ret i32 %sel
; CHECK-LABEL: @test53(
; CHECK: select i1 %cmp
; CHECK: ret
}
define i32 @test54(i32 %X, i32 %Y) {
%A = ashr exact i32 %X, %Y
%B = icmp eq i32 %A, 0
%C = select i1 %B, i32 %A, i32 1
ret i32 %C
; CHECK-LABEL: @test54(
; CHECK-NOT: ashr
; CHECK-NOT: select
; CHECK: icmp ne i32 %X, 0
; CHECK: zext
; CHECK: ret
}
define i1 @test55(i1 %X, i32 %Y, i32 %Z) {
%A = ashr exact i32 %Y, %Z
%B = select i1 %X, i32 %Y, i32 %A
%C = icmp eq i32 %B, 0
ret i1 %C
; CHECK-LABEL: @test55(
; CHECK-NOT: ashr
; CHECK-NOT: select
; CHECK: icmp eq
; CHECK: ret i1
}
define i32 @test56(i16 %x) nounwind {
%tobool = icmp eq i16 %x, 0
%conv = zext i16 %x to i32
%cond = select i1 %tobool, i32 0, i32 %conv
ret i32 %cond
; CHECK-LABEL: @test56(
; CHECK-NEXT: zext
; CHECK-NEXT: ret
}
define i32 @test57(i32 %x, i32 %y) nounwind {
%and = and i32 %x, %y
%tobool = icmp eq i32 %x, 0
%.and = select i1 %tobool, i32 0, i32 %and
ret i32 %.and
; CHECK-LABEL: @test57(
; CHECK-NEXT: and i32 %x, %y
; CHECK-NEXT: ret
}
define i32 @test58(i16 %x) nounwind {
%tobool = icmp ne i16 %x, 1
%conv = zext i16 %x to i32
%cond = select i1 %tobool, i32 %conv, i32 1
ret i32 %cond
; CHECK-LABEL: @test58(
; CHECK-NEXT: zext
; CHECK-NEXT: ret
}
define i32 @test59(i32 %x, i32 %y) nounwind {
%and = and i32 %x, %y
%tobool = icmp ne i32 %x, %y
%.and = select i1 %tobool, i32 %and, i32 %y
ret i32 %.and
; CHECK-LABEL: @test59(
; CHECK-NEXT: and i32 %x, %y
; CHECK-NEXT: ret
}
define i1 @test60(i32 %x, i1* %y) nounwind {
%cmp = icmp eq i32 %x, 0
%load = load i1, i1* %y, align 1
%cmp1 = icmp slt i32 %x, 1
%sel = select i1 %cmp, i1 %load, i1 %cmp1
ret i1 %sel
; CHECK-LABEL: @test60(
; CHECK: select
}
@glbl = constant i32 10
define i32 @test61(i32* %ptr) {
%A = load i32, i32* %ptr
%B = icmp eq i32* %ptr, @glbl
%C = select i1 %B, i32 %A, i32 10
ret i32 %C
; CHECK-LABEL: @test61(
; CHECK: ret i32 10
}
; PR14131
define void @test64(i32 %p, i16 %b) noreturn nounwind {
entry:
%p.addr.0.insert.mask = and i32 %p, -65536
%conv2 = and i32 %p, 65535
br i1 undef, label %lor.rhs, label %lor.end
lor.rhs:
%p.addr.0.extract.trunc = trunc i32 %p.addr.0.insert.mask to i16
%phitmp = zext i16 %p.addr.0.extract.trunc to i32
br label %lor.end
lor.end:
%t.1 = phi i32 [ 0, %entry ], [ %phitmp, %lor.rhs ]
%conv6 = zext i16 %b to i32
%div = udiv i32 %conv6, %t.1
%tobool8 = icmp eq i32 %div, 0
%cmp = icmp eq i32 %t.1, 0
%cmp12 = icmp ult i32 %conv2, 2
%cmp.sink = select i1 %tobool8, i1 %cmp12, i1 %cmp
br i1 %cmp.sink, label %cond.end17, label %cond.false16
cond.false16:
br label %cond.end17
cond.end17:
br label %while.body
while.body:
br label %while.body
; CHECK-LABEL: @test64(
; CHECK-NOT: select
}
@under_aligned = external global i32, align 1
define i32 @test76(i1 %flag, i32* %x) {
; The load here must not be speculated around the select. One side of the
; select is trivially dereferencable but may have a lower alignment than the
; load does.
; CHECK-LABEL: @test76(
; CHECK: store i32 0, i32* %x
; CHECK: %[[P:.*]] = select i1 %flag, i32* @under_aligned, i32* %x
; CHECK: load i32, i32* %[[P]]
store i32 0, i32* %x
%p = select i1 %flag, i32* @under_aligned, i32* %x
%v = load i32, i32* %p
ret i32 %v
}
declare void @scribble_on_i32(i32*)
define i32 @test77(i1 %flag, i32* %x) {
; The load here must not be speculated around the select. One side of the
; select is trivially dereferencable but may have a lower alignment than the
; load does.
; CHECK-LABEL: @test77(
; CHECK: %[[A:.*]] = alloca i32, align 1
; CHECK: call void @scribble_on_i32(i32* nonnull %[[A]])
; CHECK: store i32 0, i32* %x
; CHECK: %[[P:.*]] = select i1 %flag, i32* %[[A]], i32* %x
; CHECK: load i32, i32* %[[P]]
%under_aligned = alloca i32, align 1
call void @scribble_on_i32(i32* %under_aligned)
store i32 0, i32* %x
%p = select i1 %flag, i32* %under_aligned, i32* %x
%v = load i32, i32* %p
ret i32 %v
}
define i32 @test78(i1 %flag, i32* %x, i32* %y, i32* %z) {
; Test that we can speculate the loads around the select even when we can't
; fold the load completely away.
; CHECK-LABEL: @test78(
; CHECK: %[[V1:.*]] = load i32, i32* %x
; CHECK-NEXT: %[[V2:.*]] = load i32, i32* %y
; CHECK-NEXT: %[[S:.*]] = select i1 %flag, i32 %[[V1]], i32 %[[V2]]
; CHECK-NEXT: ret i32 %[[S]]
entry:
store i32 0, i32* %x
store i32 0, i32* %y
; Block forwarding by storing to %z which could alias either %x or %y.
store i32 42, i32* %z
%p = select i1 %flag, i32* %x, i32* %y
%v = load i32, i32* %p
ret i32 %v
}
define i32 @test78_deref(i1 %flag, i32* dereferenceable(4) %x, i32* dereferenceable(4) %y, i32* %z) {
; Test that we can speculate the loads around the select even when we can't
; fold the load completely away.
; CHECK-LABEL: @test78_deref(
; CHECK: %[[V1:.*]] = load i32, i32* %x
; CHECK-NEXT: %[[V2:.*]] = load i32, i32* %y
; CHECK-NEXT: %[[S:.*]] = select i1 %flag, i32 %[[V1]], i32 %[[V2]]
; CHECK-NEXT: ret i32 %[[S]]
entry:
%p = select i1 %flag, i32* %x, i32* %y
%v = load i32, i32* %p
ret i32 %v
}
define i32 @test78_neg(i1 %flag, i32* %x, i32* %y, i32* %z) {
; The same as @test78 but we can't speculate the load because it can trap
; if under-aligned.
; CHECK-LABEL: @test78_neg(
; CHECK: %p = select i1 %flag, i32* %x, i32* %y
; CHECK-NEXT: %v = load i32, i32* %p, align 16
; CHECK-NEXT: ret i32 %v
entry:
store i32 0, i32* %x
store i32 0, i32* %y
; Block forwarding by storing to %z which could alias either %x or %y.
store i32 42, i32* %z
%p = select i1 %flag, i32* %x, i32* %y
%v = load i32, i32* %p, align 16
ret i32 %v
}
define i32 @test78_deref_neg(i1 %flag, i32* dereferenceable(2) %x, i32* dereferenceable(4) %y, i32* %z) {
; The same as @test78_deref but we can't speculate the load because
; one of the arguments is not sufficiently dereferenceable.
; CHECK-LABEL: @test78_deref_neg(
; CHECK: %p = select i1 %flag, i32* %x, i32* %y
; CHECK-NEXT: %v = load i32, i32* %p
; CHECK-NEXT: ret i32 %v
entry:
%p = select i1 %flag, i32* %x, i32* %y
%v = load i32, i32* %p
ret i32 %v
}
define float @test79(i1 %flag, float* %x, i32* %y, i32* %z) {
; Test that we can speculate the loads around the select even when we can't
; fold the load completely away.
; CHECK-LABEL: @test79(
; CHECK: %[[V1:.*]] = load float, float* %x
; CHECK-NEXT: %[[V2:.*]] = load float, float* %y
; CHECK-NEXT: %[[S:.*]] = select i1 %flag, float %[[V1]], float %[[V2]]
; CHECK-NEXT: ret float %[[S]]
entry:
%x1 = bitcast float* %x to i32*
%y1 = bitcast i32* %y to float*
store i32 0, i32* %x1
store i32 0, i32* %y
; Block forwarding by storing to %z which could alias either %x or %y.
store i32 42, i32* %z
%p = select i1 %flag, float* %x, float* %y1
%v = load float, float* %p
ret float %v
}
define i32 @test80(i1 %flag) {
; Test that when we speculate the loads around the select they fold throug
; load->load folding and load->store folding.
; CHECK-LABEL: @test80(
; CHECK: %[[X:.*]] = alloca i32
; CHECK-NEXT: %[[Y:.*]] = alloca i32
; CHECK: %[[V:.*]] = load i32, i32* %[[X]]
; CHECK-NEXT: store i32 %[[V]], i32* %[[Y]]
; CHECK-NEXT: ret i32 %[[V]]
entry:
%x = alloca i32
%y = alloca i32
call void @scribble_on_i32(i32* %x)
call void @scribble_on_i32(i32* %y)
%tmp = load i32, i32* %x
store i32 %tmp, i32* %y
%p = select i1 %flag, i32* %x, i32* %y
%v = load i32, i32* %p
ret i32 %v
}
define float @test81(i1 %flag) {
; Test that we can speculate the load around the select even though they use
; differently typed pointers.
; CHECK-LABEL: @test81(
; CHECK: %[[X:.*]] = alloca i32
; CHECK-NEXT: %[[Y:.*]] = alloca i32
; CHECK: %[[V:.*]] = load i32, i32* %[[X]]
; CHECK-NEXT: store i32 %[[V]], i32* %[[Y]]
; CHECK-NEXT: %[[C:.*]] = bitcast i32 %[[V]] to float
; CHECK-NEXT: ret float %[[C]]
entry:
%x = alloca float
%y = alloca i32
%x1 = bitcast float* %x to i32*
%y1 = bitcast i32* %y to float*
call void @scribble_on_i32(i32* %x1)
call void @scribble_on_i32(i32* %y)
%tmp = load i32, i32* %x1
store i32 %tmp, i32* %y
%p = select i1 %flag, float* %x, float* %y1
%v = load float, float* %p
ret float %v
}
define i32 @test82(i1 %flag) {
; Test that we can speculate the load around the select even though they use
; differently typed pointers.
; CHECK-LABEL: @test82(
; CHECK: %[[X:.*]] = alloca float
; CHECK-NEXT: %[[Y:.*]] = alloca i32
; CHECK-NEXT: %[[X1:.*]] = bitcast float* %[[X]] to i32*
; CHECK-NEXT: %[[Y1:.*]] = bitcast i32* %[[Y]] to float*
; CHECK: %[[V:.*]] = load float, float* %[[X]]
; CHECK-NEXT: store float %[[V]], float* %[[Y1]]
; CHECK-NEXT: %[[C:.*]] = bitcast float %[[V]] to i32
; CHECK-NEXT: ret i32 %[[C]]
entry:
%x = alloca float
%y = alloca i32
%x1 = bitcast float* %x to i32*
%y1 = bitcast i32* %y to float*
call void @scribble_on_i32(i32* %x1)
call void @scribble_on_i32(i32* %y)
%tmp = load float, float* %x
store float %tmp, float* %y1
%p = select i1 %flag, i32* %x1, i32* %y
%v = load i32, i32* %p
ret i32 %v
}
declare void @scribble_on_i64(i64*)
declare void @scribble_on_i128(i128*)
define i8* @test83(i1 %flag) {
; Test that we can speculate the load around the select even though they use
; differently typed pointers and requires inttoptr casts.
; CHECK-LABEL: @test83(
; CHECK: %[[X:.*]] = alloca i8*
; CHECK-NEXT: %[[Y:.*]] = alloca i8*
; CHECK-DAG: %[[X2:.*]] = bitcast i8** %[[X]] to i64*
; CHECK-DAG: %[[Y2:.*]] = bitcast i8** %[[Y]] to i64*
; CHECK: %[[V:.*]] = load i64, i64* %[[X2]]
; CHECK-NEXT: store i64 %[[V]], i64* %[[Y2]]
; CHECK-NEXT: %[[C:.*]] = inttoptr i64 %[[V]] to i8*
; CHECK-NEXT: ret i8* %[[S]]
entry:
%x = alloca i8*
%y = alloca i64
%x1 = bitcast i8** %x to i64*
%y1 = bitcast i64* %y to i8**
call void @scribble_on_i64(i64* %x1)
call void @scribble_on_i64(i64* %y)
%tmp = load i64, i64* %x1
store i64 %tmp, i64* %y
%p = select i1 %flag, i8** %x, i8** %y1
%v = load i8*, i8** %p
ret i8* %v
}
define i64 @test84(i1 %flag) {
; Test that we can speculate the load around the select even though they use
; differently typed pointers and requires a ptrtoint cast.
; CHECK-LABEL: @test84(
; CHECK: %[[X:.*]] = alloca i8*
; CHECK-NEXT: %[[Y:.*]] = alloca i8*
; CHECK: %[[V:.*]] = load i8*, i8** %[[X]]
; CHECK-NEXT: store i8* %[[V]], i8** %[[Y]]
; CHECK-NEXT: %[[C:.*]] = ptrtoint i8* %[[V]] to i64
; CHECK-NEXT: ret i64 %[[C]]
entry:
%x = alloca i8*
%y = alloca i64
%x1 = bitcast i8** %x to i64*
%y1 = bitcast i64* %y to i8**
call void @scribble_on_i64(i64* %x1)
call void @scribble_on_i64(i64* %y)
%tmp = load i8*, i8** %x
store i8* %tmp, i8** %y1
%p = select i1 %flag, i64* %x1, i64* %y
%v = load i64, i64* %p
ret i64 %v
}
define i8* @test85(i1 %flag) {
; Test that we can't speculate the load around the select. The load of the
; pointer doesn't load all of the stored integer bits. We could fix this, but it
; would require endianness checks and other nastiness.
; CHECK-LABEL: @test85(
; CHECK: %[[T:.*]] = load i128, i128*
; CHECK-NEXT: store i128 %[[T]], i128*
; CHECK-NEXT: %[[X:.*]] = load i8*, i8**
; CHECK-NEXT: %[[Y:.*]] = load i8*, i8**
; CHECK-NEXT: %[[V:.*]] = select i1 %flag, i8* %[[X]], i8* %[[Y]]
; CHECK-NEXT: ret i8* %[[V]]
entry:
%x = alloca [2 x i8*]
%y = alloca i128
%x1 = bitcast [2 x i8*]* %x to i8**
%x2 = bitcast i8** %x1 to i128*
%y1 = bitcast i128* %y to i8**
call void @scribble_on_i128(i128* %x2)
call void @scribble_on_i128(i128* %y)
%tmp = load i128, i128* %x2
store i128 %tmp, i128* %y
%p = select i1 %flag, i8** %x1, i8** %y1
%v = load i8*, i8** %p
ret i8* %v
}
define i128 @test86(i1 %flag) {
; Test that we can't speculate the load around the select when the integer size
; is larger than the pointer size. The store of the pointer doesn't store to all
; the bits of the integer.
;
; CHECK-LABEL: @test86(
; CHECK: %[[T:.*]] = load i8*, i8**
; CHECK-NEXT: store i8* %[[T]], i8**
; CHECK-NEXT: %[[X:.*]] = load i128, i128*
; CHECK-NEXT: %[[Y:.*]] = load i128, i128*
; CHECK-NEXT: %[[V:.*]] = select i1 %flag, i128 %[[X]], i128 %[[Y]]
; CHECK-NEXT: ret i128 %[[V]]
entry:
%x = alloca [2 x i8*]
%y = alloca i128
%x1 = bitcast [2 x i8*]* %x to i8**
%x2 = bitcast i8** %x1 to i128*
%y1 = bitcast i128* %y to i8**
call void @scribble_on_i128(i128* %x2)
call void @scribble_on_i128(i128* %y)
%tmp = load i8*, i8** %x1
store i8* %tmp, i8** %y1
%p = select i1 %flag, i128* %x2, i128* %y
%v = load i128, i128* %p
ret i128 %v
}
define i32 @test_select_select0(i32 %a, i32 %r0, i32 %r1, i32 %v1, i32 %v2) {
; CHECK-LABEL: @test_select_select0(
; CHECK: %[[C0:.*]] = icmp sge i32 %a, %v1
; CHECK-NEXT: %[[C1:.*]] = icmp slt i32 %a, %v2
; CHECK-NEXT: %[[C:.*]] = and i1 %[[C1]], %[[C0]]
; CHECK-NEXT: %[[SEL:.*]] = select i1 %[[C]], i32 %r0, i32 %r1
; CHECK-NEXT: ret i32 %[[SEL]]
%c0 = icmp sge i32 %a, %v1
%s0 = select i1 %c0, i32 %r0, i32 %r1
%c1 = icmp slt i32 %a, %v2
%s1 = select i1 %c1, i32 %s0, i32 %r1
ret i32 %s1
}
define i32 @test_select_select1(i32 %a, i32 %r0, i32 %r1, i32 %v1, i32 %v2) {
; CHECK-LABEL: @test_select_select1(
; CHECK: %[[C0:.*]] = icmp sge i32 %a, %v1
; CHECK-NEXT: %[[C1:.*]] = icmp slt i32 %a, %v2
; CHECK-NEXT: %[[C:.*]] = or i1 %[[C1]], %[[C0]]
; CHECK-NEXT: %[[SEL:.*]] = select i1 %[[C]], i32 %r0, i32 %r1
; CHECK-NEXT: ret i32 %[[SEL]]
%c0 = icmp sge i32 %a, %v1
%s0 = select i1 %c0, i32 %r0, i32 %r1
%c1 = icmp slt i32 %a, %v2
%s1 = select i1 %c1, i32 %r0, i32 %s0
ret i32 %s1
}
define i32 @PR23757(i32 %x) {
; CHECK-LABEL: @PR23757
; CHECK: %[[cmp:.*]] = icmp eq i32 %x, 2147483647
; CHECK-NEXT: %[[add:.*]] = add nsw i32 %x, 1
; CHECK-NEXT: %[[sel:.*]] = select i1 %[[cmp]], i32 -2147483648, i32 %[[add]]
; CHECK-NEXT: ret i32 %[[sel]]
%cmp = icmp eq i32 %x, 2147483647
%add = add nsw i32 %x, 1
%sel = select i1 %cmp, i32 -2147483648, i32 %add
ret i32 %sel
}
; max(max(~a, -1), -1) --> max(~a, -1)
define i32 @PR27137(i32 %a) {
; CHECK-LABEL: @PR27137(
; CHECK-NEXT: [[NOT_A:%.*]] = xor i32 %a, -1
; CHECK-NEXT: [[C0:%.*]] = icmp slt i32 %a, 0
; CHECK-NEXT: [[S0:%.*]] = select i1 [[C0]], i32 [[NOT_A]], i32 -1
; CHECK-NEXT: ret i32 [[S0]]
;
%not_a = xor i32 %a, -1
%c0 = icmp slt i32 %a, 0
%s0 = select i1 %c0, i32 %not_a, i32 -1
%c1 = icmp sgt i32 %s0, -1
%s1 = select i1 %c1, i32 %s0, i32 -1
ret i32 %s1
}
define i32 @select_icmp_slt0_xor(i32 %x) {
; CHECK-LABEL: @select_icmp_slt0_xor(
; CHECK-NEXT: [[TMP1:%.*]] = or i32 %x, -2147483648
; CHECK-NEXT: ret i32 [[TMP1]]
;
%cmp = icmp slt i32 %x, zeroinitializer
%xor = xor i32 %x, 2147483648
%x.xor = select i1 %cmp, i32 %x, i32 %xor
ret i32 %x.xor
}
define <2 x i32> @select_icmp_slt0_xor_vec(<2 x i32> %x) {
; CHECK-LABEL: @select_icmp_slt0_xor_vec(
; CHECK-NEXT: [[TMP1:%.*]] = or <2 x i32> %x, <i32 -2147483648, i32 -2147483648>
; CHECK-NEXT: ret <2 x i32> [[TMP1]]
;
%cmp = icmp slt <2 x i32> %x, zeroinitializer
%xor = xor <2 x i32> %x, <i32 2147483648, i32 2147483648>
%x.xor = select <2 x i1> %cmp, <2 x i32> %x, <2 x i32> %xor
ret <2 x i32> %x.xor
}
; Make sure that undef elements of the select condition are translated into undef elements of the shuffle mask.
define <4 x i32> @canonicalize_to_shuffle(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @canonicalize_to_shuffle(
; CHECK-NEXT: [[SEL:%.*]] = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 0, i32 undef, i32 6, i32 undef>
; CHECK-NEXT: ret <4 x i32> [[SEL]]
;
%sel = select <4 x i1> <i1 true, i1 undef, i1 false, i1 undef>, <4 x i32> %a, <4 x i32> %b
ret <4 x i32> %sel
}
; Don't die or try if the condition mask is a constant expression or contains a constant expression.
@g = global i32 0
define <4 x i32> @cannot_canonicalize_to_shuffle1(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @cannot_canonicalize_to_shuffle1(
; CHECK-NEXT: [[SEL:%.*]] = select <4 x i1> bitcast (i4 ptrtoint (i32* @g to i4) to <4 x i1>), <4 x i32> %a, <4 x i32> %b
; CHECK-NEXT: ret <4 x i32> [[SEL]]
;
%sel = select <4 x i1> bitcast (i4 ptrtoint (i32* @g to i4) to <4 x i1>), <4 x i32> %a, <4 x i32> %b
ret <4 x i32> %sel
}
define <4 x i32> @cannot_canonicalize_to_shuffle2(<4 x i32> %a, <4 x i32> %b) {
; CHECK-LABEL: @cannot_canonicalize_to_shuffle2(
; CHECK-NEXT: [[SEL:%.*]] = select <4 x i1> <i1 true, i1 undef, i1 false, i1 icmp sle (i16 ptrtoint (i32* @g to i16), i16 4)>, <4 x i32> %a, <4 x i32> %b
; CHECK-NEXT: ret <4 x i32> [[SEL]]
;
%sel = select <4 x i1> <i1 true, i1 undef, i1 false, i1 icmp sle (i16 ptrtoint (i32* @g to i16), i16 4)>, <4 x i32> %a, <4 x i32> %b
ret <4 x i32> %sel
}
declare void @llvm.assume(i1)
define i8 @assume_cond_true(i1 %cond, i8 %x, i8 %y) {
; CHECK-LABEL: @assume_cond_true(
; CHECK-NEXT: call void @llvm.assume(i1 %cond)
; CHECK-NEXT: ret i8 %x
;
call void @llvm.assume(i1 %cond)
%sel = select i1 %cond, i8 %x, i8 %y
ret i8 %sel
}
; FIXME: computeKnownBitsFromAssume() should understand the 'not' of an assumed condition.
define i8 @assume_cond_false(i1 %cond, i8 %x, i8 %y) {
; CHECK-LABEL: @assume_cond_false(
; CHECK-NEXT: [[NOTCOND:%.*]] = xor i1 %cond, true
; CHECK-NEXT: call void @llvm.assume(i1 [[NOTCOND]])
; CHECK-NEXT: [[SEL:%.*]] = select i1 %cond, i8 %x, i8 %y
; CHECK-NEXT: ret i8 [[SEL]]
;
%notcond = xor i1 %cond, true
call void @llvm.assume(i1 %notcond)
%sel = select i1 %cond, i8 %x, i8 %y
ret i8 %sel
}
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