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llvm/test/Transforms/InstCombine/phi.ll
Craig Topper c590a00f89 Revert "[ValueTracking] Teach computeKnownBits for PHI nodes to compute sign bit for a recurrence with a NSW addition." 
This is breaking an optimizaton remark test in clang. I've identified a couple fixes for that, but want to understand it better before I commit to anything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274102 91177308-0d34-0410-b5e6-96231b3b80d8
2016-06-29 04:57:00 +00:00

882 lines
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; This test makes sure that these instructions are properly eliminated.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128:n8:16:32:64"
define i32 @test1(i32 %A, i1 %b) {
BB0:
br i1 %b, label %BB1, label %BB2
BB1:
; Combine away one argument PHI nodes
%B = phi i32 [ %A, %BB0 ]
ret i32 %B
BB2:
ret i32 %A
; CHECK-LABEL: @test1(
; CHECK: BB1:
; CHECK-NEXT: ret i32 %A
}
define i32 @test2(i32 %A, i1 %b) {
BB0:
br i1 %b, label %BB1, label %BB2
BB1:
br label %BB2
BB2:
; Combine away PHI nodes with same values
%B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ]
ret i32 %B
; CHECK-LABEL: @test2(
; CHECK: BB2:
; CHECK-NEXT: ret i32 %A
}
define i32 @test3(i32 %A, i1 %b) {
BB0:
br label %Loop
Loop:
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ %B, %Loop ]
br i1 %b, label %Loop, label %Exit
Exit:
ret i32 %B
; CHECK-LABEL: @test3(
; CHECK: Exit:
; CHECK-NEXT: ret i32 %A
}
define i32 @test4(i1 %b) {
BB0:
; Loop is unreachable
ret i32 7
Loop: ; preds = %L2, %Loop
; PHI has same value always.
%B = phi i32 [ %B, %L2 ], [ %B, %Loop ]
br i1 %b, label %L2, label %Loop
L2: ; preds = %Loop
br label %Loop
; CHECK-LABEL: @test4(
; CHECK: Loop:
; CHECK-NEXT: br i1 %b
}
define i32 @test5(i32 %A, i1 %b) {
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ undef, %Loop ]
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i32 %B
; CHECK-LABEL: @test5(
; CHECK: Loop:
; CHECK-NEXT: br i1 %b
; CHECK: Exit:
; CHECK-NEXT: ret i32 %A
}
define i32 @test6(i16 %A, i1 %b) {
BB0:
%X = zext i16 %A to i32
br i1 %b, label %BB1, label %BB2
BB1:
%Y = zext i16 %A to i32
br label %BB2
BB2:
;; Suck casts into phi
%B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32 %B
; CHECK-LABEL: @test6(
; CHECK: BB2:
; CHECK: zext i16 %A to i32
; CHECK-NEXT: ret i32
}
define i32 @test7(i32 %A, i1 %b) {
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
; PHI is dead.
%B = phi i32 [ %A, %BB0 ], [ %C, %Loop ]
%C = add i32 %B, 123
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i32 0
; CHECK-LABEL: @test7(
; CHECK: Loop:
; CHECK-NEXT: br i1 %b
}
define i32* @test8({ i32, i32 } *%A, i1 %b) {
BB0:
%X = getelementptr inbounds { i32, i32 }, { i32, i32 } *%A, i32 0, i32 1
br i1 %b, label %BB1, label %BB2
BB1:
%Y = getelementptr { i32, i32 }, { i32, i32 } *%A, i32 0, i32 1
br label %BB2
BB2:
;; Suck GEPs into phi
%B = phi i32* [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32* %B
; CHECK-LABEL: @test8(
; CHECK-NOT: phi
; CHECK: BB2:
; CHECK-NEXT: %B = getelementptr { i32, i32 }, { i32, i32 }* %A
; CHECK-NEXT: ret i32* %B
}
define i32 @test9(i32* %A, i32* %B) {
entry:
%c = icmp eq i32* %A, null
br i1 %c, label %bb1, label %bb
bb:
%C = load i32, i32* %B, align 1
br label %bb2
bb1:
%D = load i32, i32* %A, align 1
br label %bb2
bb2:
%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
ret i32 %E
; CHECK-LABEL: @test9(
; CHECK: bb2:
; CHECK-NEXT: phi i32* [ %B, %bb ], [ %A, %bb1 ]
; CHECK-NEXT: %E = load i32, i32* %{{[^,]*}}, align 1
; CHECK-NEXT: ret i32 %E
}
define i32 @test10(i32* %A, i32* %B) {
entry:
%c = icmp eq i32* %A, null
br i1 %c, label %bb1, label %bb
bb:
%C = load i32, i32* %B, align 16
br label %bb2
bb1:
%D = load i32, i32* %A, align 32
br label %bb2
bb2:
%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
ret i32 %E
; CHECK-LABEL: @test10(
; CHECK: bb2:
; CHECK-NEXT: phi i32* [ %B, %bb ], [ %A, %bb1 ]
; CHECK-NEXT: %E = load i32, i32* %{{[^,]*}}, align 16
; CHECK-NEXT: ret i32 %E
}
; PR1777
declare i1 @test11a()
define i1 @test11() {
entry:
%a = alloca i32
%i = ptrtoint i32* %a to i64
%b = call i1 @test11a()
br i1 %b, label %one, label %two
one:
%x = phi i64 [%i, %entry], [%y, %two]
%c = call i1 @test11a()
br i1 %c, label %two, label %end
two:
%y = phi i64 [%i, %entry], [%x, %one]
%d = call i1 @test11a()
br i1 %d, label %one, label %end
end:
%f = phi i64 [ %x, %one], [%y, %two]
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
; even though %f must equal %i at this point
%g = inttoptr i64 %f to i32*
store i32 10, i32* %g
%z = call i1 @test11a()
ret i1 %z
; CHECK-LABEL: @test11(
; CHECK-NOT: phi i32
; CHECK: ret i1 %z
}
define i64 @test12(i1 %cond, i8* %Ptr, i64 %Val) {
entry:
%tmp41 = ptrtoint i8* %Ptr to i64
%tmp42 = zext i64 %tmp41 to i128
br i1 %cond, label %end, label %two
two:
%tmp36 = zext i64 %Val to i128 ; <i128> [#uses=1]
%tmp37 = shl i128 %tmp36, 64 ; <i128> [#uses=1]
%ins39 = or i128 %tmp42, %tmp37 ; <i128> [#uses=1]
br label %end
end:
%tmp869.0 = phi i128 [ %tmp42, %entry ], [ %ins39, %two ]
%tmp32 = trunc i128 %tmp869.0 to i64 ; <i64> [#uses=1]
%tmp29 = lshr i128 %tmp869.0, 64 ; <i128> [#uses=1]
%tmp30 = trunc i128 %tmp29 to i64 ; <i64> [#uses=1]
%tmp2 = add i64 %tmp32, %tmp30
ret i64 %tmp2
; CHECK-LABEL: @test12(
; CHECK-NOT: zext
; CHECK: end:
; CHECK-NEXT: phi i64 [ 0, %entry ], [ %Val, %two ]
; CHECK-NOT: phi
; CHECK: ret i64
}
declare void @test13f(double, i32)
define void @test13(i1 %cond, i32 %V1, double %Vald) {
entry:
%tmp42 = zext i32 %V1 to i128
br i1 %cond, label %end, label %two
two:
%Val = bitcast double %Vald to i64
%tmp36 = zext i64 %Val to i128 ; <i128> [#uses=1]
%tmp37 = shl i128 %tmp36, 64 ; <i128> [#uses=1]
%ins39 = or i128 %tmp42, %tmp37 ; <i128> [#uses=1]
br label %end
end:
%tmp869.0 = phi i128 [ %tmp42, %entry ], [ %ins39, %two ]
%tmp32 = trunc i128 %tmp869.0 to i32
%tmp29 = lshr i128 %tmp869.0, 64 ; <i128> [#uses=1]
%tmp30 = trunc i128 %tmp29 to i64 ; <i64> [#uses=1]
%tmp31 = bitcast i64 %tmp30 to double
call void @test13f(double %tmp31, i32 %tmp32)
ret void
; CHECK-LABEL: @test13(
; CHECK-NOT: zext
; CHECK: end:
; CHECK-NEXT: phi double [ 0.000000e+00, %entry ], [ %Vald, %two ]
; CHECK-NEXT: call void @test13f(double {{[^,]*}}, i32 %V1)
; CHECK: ret void
}
define i640 @test14a(i320 %A, i320 %B, i1 %b1) {
BB0:
%a = zext i320 %A to i640
%b = zext i320 %B to i640
br label %Loop
Loop:
%C = phi i640 [ %a, %BB0 ], [ %b, %Loop ]
br i1 %b1, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i640 %C
; CHECK-LABEL: @test14a(
; CHECK: Loop:
; CHECK-NEXT: phi i320
}
define i160 @test14b(i320 %A, i320 %B, i1 %b1) {
BB0:
%a = trunc i320 %A to i160
%b = trunc i320 %B to i160
br label %Loop
Loop:
%C = phi i160 [ %a, %BB0 ], [ %b, %Loop ]
br i1 %b1, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i160 %C
; CHECK-LABEL: @test14b(
; CHECK: Loop:
; CHECK-NEXT: phi i160
}
declare i64 @test15a(i64)
define i64 @test15b(i64 %A, i1 %b) {
; CHECK-LABEL: @test15b(
entry:
%i0 = zext i64 %A to i128
%i1 = shl i128 %i0, 64
%i = or i128 %i1, %i0
br i1 %b, label %one, label %two
; CHECK: entry:
; CHECK-NEXT: br i1 %b
one:
%x = phi i128 [%i, %entry], [%y, %two]
%x1 = lshr i128 %x, 64
%x2 = trunc i128 %x1 to i64
%c = call i64 @test15a(i64 %x2)
%c1 = zext i64 %c to i128
br label %two
; CHECK: one:
; CHECK-NEXT: phi i64
; CHECK-NEXT: %c = call i64 @test15a
two:
%y = phi i128 [%i, %entry], [%c1, %one]
%y1 = lshr i128 %y, 64
%y2 = trunc i128 %y1 to i64
%d = call i64 @test15a(i64 %y2)
%d1 = trunc i64 %d to i1
br i1 %d1, label %one, label %end
; CHECK: two:
; CHECK-NEXT: phi i64
; CHECK-NEXT: phi i64
; CHECK-NEXT: %d = call i64 @test15a
end:
%g = trunc i128 %y to i64
ret i64 %g
; CHECK: end:
; CHECK-NEXT: ret i64
}
; PR6512 - Shouldn't merge loads from different addr spaces.
define i32 @test16(i32 addrspace(1)* %pointer1, i32 %flag, i32* %pointer2)
nounwind {
entry:
%retval = alloca i32, align 4 ; <i32*> [#uses=2]
%pointer1.addr = alloca i32 addrspace(1)*, align 4 ; <i32 addrspace(1)**>
%flag.addr = alloca i32, align 4 ; <i32*> [#uses=2]
%pointer2.addr = alloca i32*, align 4 ; <i32**> [#uses=2]
%res = alloca i32, align 4 ; <i32*> [#uses=4]
store i32 addrspace(1)* %pointer1, i32 addrspace(1)** %pointer1.addr
store i32 %flag, i32* %flag.addr
store i32* %pointer2, i32** %pointer2.addr
store i32 10, i32* %res
%tmp = load i32, i32* %flag.addr ; <i32> [#uses=1]
%tobool = icmp ne i32 %tmp, 0 ; <i1> [#uses=1]
br i1 %tobool, label %if.then, label %if.else
return: ; preds = %if.end
%tmp7 = load i32, i32* %retval ; <i32> [#uses=1]
ret i32 %tmp7
if.end: ; preds = %if.else, %if.then
%tmp6 = load i32, i32* %res ; <i32> [#uses=1]
store i32 %tmp6, i32* %retval
br label %return
if.then: ; preds = %entry
%tmp1 = load i32 addrspace(1)*, i32 addrspace(1)** %pointer1.addr ; <i32 addrspace(1)*>
%arrayidx = getelementptr i32, i32 addrspace(1)* %tmp1, i32 0 ; <i32 addrspace(1)*> [#uses=1]
%tmp2 = load i32, i32 addrspace(1)* %arrayidx ; <i32> [#uses=1]
store i32 %tmp2, i32* %res
br label %if.end
if.else: ; preds = %entry
%tmp3 = load i32*, i32** %pointer2.addr ; <i32*> [#uses=1]
%arrayidx4 = getelementptr i32, i32* %tmp3, i32 0 ; <i32*> [#uses=1]
%tmp5 = load i32, i32* %arrayidx4 ; <i32> [#uses=1]
store i32 %tmp5, i32* %res
br label %if.end
}
; PR4413
declare i32 @ext()
; CHECK-LABEL: @test17(
define i32 @test17(i1 %a) {
entry:
br i1 %a, label %bb1, label %bb2
bb1: ; preds = %entry
%0 = tail call i32 @ext() ; <i32> [#uses=1]
br label %bb2
bb2: ; preds = %bb1, %entry
%cond = phi i1 [ true, %bb1 ], [ false, %entry ] ; <i1> [#uses=1]
; CHECK-NOT: %val = phi i32 [ %0, %bb1 ], [ 0, %entry ]
%val = phi i32 [ %0, %bb1 ], [ 0, %entry ] ; <i32> [#uses=1]
%res = select i1 %cond, i32 %val, i32 0 ; <i32> [#uses=1]
; CHECK: ret i32 %cond
ret i32 %res
}
define i1 @test18(i1 %cond) {
%zero = alloca i32
%one = alloca i32
br i1 %cond, label %true, label %false
true:
br label %ret
false:
br label %ret
ret:
%ptr = phi i32* [ %zero, %true ] , [ %one, %false ]
%isnull = icmp eq i32* %ptr, null
ret i1 %isnull
; CHECK-LABEL: @test18(
; CHECK: ret i1 false
}
define i1 @test19(i1 %cond, double %x) {
br i1 %cond, label %true, label %false
true:
br label %ret
false:
br label %ret
ret:
%p = phi double [ %x, %true ], [ 0x7FF0000000000000, %false ]; RHS = +infty
%cmp = fcmp ule double %x, %p
ret i1 %cmp
; CHECK-LABEL: @test19(
; CHECK: ret i1 true
}
define i1 @test20(i1 %cond) {
%a = alloca i32
%b = alloca i32
%c = alloca i32
br i1 %cond, label %true, label %false
true:
br label %ret
false:
br label %ret
ret:
%p = phi i32* [ %a, %true ], [ %b, %false ]
%r = icmp eq i32* %p, %c
ret i1 %r
; CHECK-LABEL: @test20(
; CHECK: ret i1 false
}
define i1 @test21(i1 %c1, i1 %c2) {
%a = alloca i32
%b = alloca i32
%c = alloca i32
br i1 %c1, label %true, label %false
true:
br label %loop
false:
br label %loop
loop:
%p = phi i32* [ %a, %true ], [ %b, %false ], [ %p, %loop ]
%r = icmp eq i32* %p, %c
br i1 %c2, label %ret, label %loop
ret:
ret i1 %r
; CHECK-LABEL: @test21(
; CHECK: ret i1 false
}
define void @test22() {
; CHECK-LABEL: @test22(
entry:
br label %loop
loop:
%phi = phi i32 [ 0, %entry ], [ %y, %loop ]
%y = add i32 %phi, 1
%o = or i32 %y, %phi
%e = icmp eq i32 %o, %y
br i1 %e, label %loop, label %ret
; CHECK: br i1 %e
ret:
ret void
}
define i32 @test23(i32 %A, i1 %b, i32 * %P) {
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ 42, %Loop ]
%D = add i32 %B, 19
store i32 %D, i32* %P
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
%E = add i32 %B, 19
ret i32 %E
; CHECK-LABEL: @test23(
; CHECK: %phitmp = add i32 %A, 19
; CHECK: Loop:
; CHECK-NEXT: %B = phi i32 [ %phitmp, %BB0 ], [ 61, %Loop ]
; CHECK: Exit:
; CHECK-NEXT: ret i32 %B
}
define i32 @test24(i32 %A, i1 %cond) {
BB0:
%X = add nuw nsw i32 %A, 1
br i1 %cond, label %BB1, label %BB2
BB1:
%Y = add nuw i32 %A, 1
br label %BB2
BB2:
%C = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32 %C
; CHECK-LABEL: @test24(
; CHECK-NOT: phi
; CHECK: BB2:
; CHECK-NEXT: %C = add nuw i32 %A, 1
; CHECK-NEXT: ret i32 %C
}
; Same as test11, but used to be missed due to a bug.
declare i1 @test25a()
define i1 @test25() {
entry:
%a = alloca i32
%i = ptrtoint i32* %a to i64
%b = call i1 @test25a()
br i1 %b, label %one, label %two
one:
%x = phi i64 [%y, %two], [%i, %entry]
%c = call i1 @test25a()
br i1 %c, label %two, label %end
two:
%y = phi i64 [%x, %one], [%i, %entry]
%d = call i1 @test25a()
br i1 %d, label %one, label %end
end:
%f = phi i64 [ %x, %one], [%y, %two]
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
; even though %f must equal %i at this point
%g = inttoptr i64 %f to i32*
store i32 10, i32* %g
%z = call i1 @test25a()
ret i1 %z
; CHECK-LABEL: @test25(
; CHECK-NOT: phi i32
; CHECK: ret i1 %z
}
declare i1 @test26a()
define i1 @test26(i32 %n) {
entry:
%a = alloca i32
%i = ptrtoint i32* %a to i64
%b = call i1 @test26a()
br label %one
one:
%x = phi i64 [%y, %two], [%w, %three], [%i, %entry]
%c = call i1 @test26a()
switch i32 %n, label %end [
i32 2, label %two
i32 3, label %three
]
two:
%y = phi i64 [%x, %one], [%w, %three]
%d = call i1 @test26a()
switch i32 %n, label %end [
i32 10, label %one
i32 30, label %three
]
three:
%w = phi i64 [%y, %two], [%x, %one]
%e = call i1 @test26a()
br i1 %e, label %one, label %two
end:
%f = phi i64 [ %x, %one], [%y, %two]
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
; even though %f must equal %i at this point
%g = inttoptr i64 %f to i32*
store i32 10, i32* %g
%z = call i1 @test26a()
ret i1 %z
; CHECK-LABEL: @test26(
; CHECK-NOT: phi i32
; CHECK: ret i1 %z
}
; CHECK-LABEL: @test27(
; CHECK: ret i32 undef
define i32 @test27(i1 %b) {
entry:
br label %done
done:
%y = phi i32 [ undef, %entry ]
ret i32 %y
}
; We should be able to fold the zexts to the other side of the phi
; even though there's a constant value input to the phi. This is
; because we can shrink that constant to the smaller phi type.
define i1 @PR24766(i8 %x1, i8 %x2, i8 %condition) {
entry:
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ 0, %entry ], [ %frombool2, %sw2 ], [ %frombool1, %sw1 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
; CHECK-LABEL: @PR24766(
; CHECK: %[[RES:.*]] = phi i1 [ false, %entry ], [ %cmp2, %sw2 ], [ %cmp1, %sw1 ]
; CHECK-NEXT: ret i1 %[[RES]]
}
; Same as above (a phi with more than 2 operands), but no constants
define i1 @PR24766_no_constants(i8 %x1, i8 %x2, i8 %condition, i1 %another_condition) {
entry:
%frombool0 = zext i1 %another_condition to i8
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ %frombool0, %entry ], [ %frombool2, %sw2 ], [ %frombool1, %sw1 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
; CHECK-LABEL: @PR24766_no_constants(
; CHECK: %[[RES:.*]] = phi i1 [ %another_condition, %entry ], [ %cmp2, %sw2 ], [ %cmp1, %sw1 ]
; CHECK-NEXT: ret i1 %[[RES]]
}
; Same as above (a phi with more than 2 operands), but two constants
define i1 @PR24766_two_constants(i8 %x1, i8 %x2, i8 %condition) {
entry:
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ 0, %entry ], [ 1, %sw2 ], [ %frombool1, %sw1 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
; CHECK-LABEL: @PR24766_two_constants(
; CHECK: %[[RES:.*]] = phi i1 [ false, %entry ], [ true, %sw2 ], [ %cmp1, %sw1 ]
; CHECK-NEXT: ret i1 %[[RES]]
}
; Same as above (a phi with more than 2 operands), but two constants and two variables
define i1 @PR24766_two_constants_two_var(i8 %x1, i8 %x2, i8 %condition) {
entry:
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
i32 2, label %sw3
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
sw3:
%cmp3 = icmp sge i8 %x1, %x2
%frombool3 = zext i1 %cmp3 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ 0, %entry ], [ %frombool2, %sw2 ], [ %frombool1, %sw1 ], [ 1, %sw3 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
; CHECK-LABEL: @PR24766_two_constants_two_var(
; CHECK: %[[RES:.*]] = phi i1 [ false, %entry ], [ %cmp2, %sw2 ], [ %cmp1, %sw1 ], [ true, %sw3 ]
; CHECK-NEXT: ret i1 %[[RES]]
}
; CHECK-LABEL: phi_allnonzeroconstant
; CHECK-NOT: phi i32
; CHECK: ret i1 false
define i1 @phi_allnonzeroconstant(i1 %c, i32 %a, i32 %b) {
entry:
br i1 %c, label %if.then, label %if.else
if.then: ; preds = %entry
br label %if.end
if.else: ; preds = %entry
call void @dummy()
br label %if.end
if.end: ; preds = %if.else, %if.then
%x.0 = phi i32 [ 1, %if.then ], [ 2, %if.else ]
%or = or i32 %x.0, %a
%cmp1 = icmp eq i32 %or, 0
ret i1 %cmp1
}
declare void @dummy()
; CHECK-LABEL: @phi_knownnonzero_eq
; CHECK-LABEL: if.then:
; CHECK-NOT: select
; CHECK-LABEL: if.end:
; CHECK: phi i32 [ 1, %if.then ]
define i1 @phi_knownnonzero_eq(i32 %n, i32 %s, i32* nocapture readonly %P) {
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.then ], [ %n, %entry ]
%cmp1 = icmp eq i32 %a.0, 0
ret i1 %cmp1
}
; CHECK-LABEL: @phi_knownnonzero_ne
; CHECK-LABEL: if.then:
; CHECK-NOT: select
; CHECK-LABEL: if.end:
; CHECK: phi i32 [ 1, %if.then ]
define i1 @phi_knownnonzero_ne(i32 %n, i32 %s, i32* nocapture readonly %P) {
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.then ], [ %n, %entry ]
%cmp1 = icmp ne i32 %a.0, 0
ret i1 %cmp1
}
; CHECK-LABEL: @phi_knownnonzero_eq_2
; CHECK-LABEL: if.then:
; CHECK-NOT: select
; CHECK-LABEL: if.end:
; CHECK: phi i32 [ 2, %if.else ]
define i1 @phi_knownnonzero_eq_2(i32 %n, i32 %s, i32* nocapture readonly %P) {
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.then, label %if.end
if.then:
%tobool2 = icmp slt i32 %n, %s
br i1 %tobool2, label %if.else, label %if.end
if.else: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.else], [ %n, %entry ], [2, %if.then]
%cmp1 = icmp eq i32 %a.0, 0
ret i1 %cmp1
}
; CHECK-LABEL: @phi_knownnonzero_ne_2
; CHECK-LABEL: if.then:
; CHECK-NOT: select
; CHECK-LABEL: if.end:
; CHECK: phi i32 [ 2, %if.else ]
define i1 @phi_knownnonzero_ne_2(i32 %n, i32 %s, i32* nocapture readonly %P) {
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.then, label %if.end
if.then:
%tobool2 = icmp slt i32 %n, %s
br i1 %tobool2, label %if.else, label %if.end
if.else: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.else], [ %n, %entry ], [2, %if.then]
%cmp1 = icmp ne i32 %a.0, 0
ret i1 %cmp1
}
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