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llvm/test/Transforms/InstCombine/sext.ll
Sanjay Patel fea0530bd5 [InstCombine] canonicalize min/max constant to select's false value 
This is a first step towards canonicalization and improved folding/codegen
for integer min/max as discussed here:
http://lists.llvm.org/pipermail/llvm-dev/2016-November/106868.html

Here, we're just matching the simplest min/max patterns and adjusting the
icmp predicate while swapping the select operands.

I've included FIXME tests in test/Transforms/InstCombine/select_meta.ll
so it's easier to see how this might be extended (corresponds to the TODO
comment in the code). That's also why I'm using matchSelectPattern()
rather than a simpler check; once the backend is patched, we can just 
remove some of the restrictions to allow the obfuscated min/max patterns
in the FIXME tests to be matched.

Differential Revision: https://reviews.llvm.org/D26525


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287585 91177308-0d34-0410-b5e6-96231b3b80d8
2016-11-21 22:04:14 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; 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"
declare i32 @llvm.ctpop.i32(i32)
declare i32 @llvm.ctlz.i32(i32, i1)
declare i32 @llvm.cttz.i32(i32, i1)
define i64 @test1(i32 %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[T:%.*]] = call i32 @llvm.ctpop.i32(i32 %x)
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%t = call i32 @llvm.ctpop.i32(i32 %x)
%s = sext i32 %t to i64
ret i64 %s
}
define i64 @test2(i32 %x) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[T:%.*]] = call i32 @llvm.ctlz.i32(i32 %x, i1 true)
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%t = call i32 @llvm.ctlz.i32(i32 %x, i1 true)
%s = sext i32 %t to i64
ret i64 %s
}
define i64 @test3(i32 %x) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: [[T:%.*]] = call i32 @llvm.cttz.i32(i32 %x, i1 true)
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%t = call i32 @llvm.cttz.i32(i32 %x, i1 true)
%s = sext i32 %t to i64
ret i64 %s
}
define i64 @test4(i32 %x) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: [[T:%.*]] = udiv i32 %x, 3
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%t = udiv i32 %x, 3
%s = sext i32 %t to i64
ret i64 %s
}
define i64 @test5(i32 %x) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: [[T:%.*]] = urem i32 %x, 30000
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%t = urem i32 %x, 30000
%s = sext i32 %t to i64
ret i64 %s
}
define i64 @test6(i32 %x) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[U:%.*]] = lshr i32 %x, 3
; CHECK-NEXT: [[T:%.*]] = mul nuw nsw i32 [[U]], 3
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[T]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%u = lshr i32 %x, 3
%t = mul i32 %u, 3
%s = sext i32 %t to i64
ret i64 %s
}
define i64 @test7(i32 %x) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: [[T:%.*]] = and i32 %x, 511
; CHECK-NEXT: [[U:%.*]] = sub nsw i32 20000, [[T]]
; CHECK-NEXT: [[S1:%.*]] = zext i32 [[U]] to i64
; CHECK-NEXT: ret i64 [[S1]]
;
%t = and i32 %x, 511
%u = sub i32 20000, %t
%s = sext i32 %u to i64
ret i64 %s
}
define i32 @test8(i8 %a, i32 %f, i1 %p, i32* %z) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: [[D:%.*]] = lshr i32 %f, 24
; CHECK-NEXT: [[N:%.*]] = select i1 %p, i32 [[D]], i32 0
; CHECK-NEXT: ret i32 [[N]]
;
%d = lshr i32 %f, 24
%e = select i1 %p, i32 %d, i32 0
%s = trunc i32 %e to i16
%n = sext i16 %s to i32
ret i32 %n
}
; rdar://6013816
define i16 @test9(i16 %t, i1 %cond) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 %cond, label %T, label %F
; CHECK: T:
; CHECK-NEXT: br label %F
; CHECK: F:
; CHECK-NEXT: [[V_OFF0:%.*]] = phi i16 [ %t, %T ], [ 42, %entry ]
; CHECK-NEXT: ret i16 [[V_OFF0]]
;
entry:
br i1 %cond, label %T, label %F
T:
%t2 = sext i16 %t to i32
br label %F
F:
%V = phi i32 [%t2, %T], [42, %entry]
%W = trunc i32 %V to i16
ret i16 %W
}
; PR2638
define i32 @test10(i32 %i) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[B1:%.*]] = shl i32 %i, 30
; CHECK-NEXT: [[B:%.*]] = ashr exact i32 [[B:%.*]]1, 30
; CHECK-NEXT: ret i32 [[B]]
;
%tmp12 = trunc i32 %i to i8
%tmp16 = shl i8 %tmp12, 6
%a = ashr i8 %tmp16, 6
%b = sext i8 %a to i32
ret i32 %b
}
define void @test11(<2 x i16> %srcA, <2 x i16> %srcB, <2 x i16>* %dst) {
; CHECK-LABEL: @test11(
; CHECK-NEXT: [[CMP:%.*]] = icmp eq <2 x i16> %srcB, %srcA
; CHECK-NEXT: [[SEXT:%.*]] = sext <2 x i1> [[CMP]] to <2 x i16>
; CHECK-NEXT: store <2 x i16> [[SEXT]], <2 x i16>* %dst, align 4
; CHECK-NEXT: ret void
;
%cmp = icmp eq <2 x i16> %srcB, %srcA
%sext = sext <2 x i1> %cmp to <2 x i16>
%tmask = ashr <2 x i16> %sext, <i16 15, i16 15>
store <2 x i16> %tmask, <2 x i16>* %dst
ret void
}
define i64 @test12(i32 %x) {
; CHECK-LABEL: @test12(
; CHECK-NEXT: [[SHR:%.*]] = lshr i32 %x, 1
; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 0, [[SHR]]
; CHECK-NEXT: [[CONV:%.*]] = sext i32 [[SUB]] to i64
; CHECK-NEXT: ret i64 [[CONV]]
;
%shr = lshr i32 %x, 1
%sub = sub nsw i32 0, %shr
%conv = sext i32 %sub to i64
ret i64 %conv
}
define i32 @test13(i32 %x) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: [[AND:%.*]] = lshr i32 %x, 3
; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[AND]], 1
; CHECK-NEXT: [[SEXT:%.*]] = add nsw i32 [[TMP1]], -1
; CHECK-NEXT: ret i32 [[SEXT]]
;
%and = and i32 %x, 8
%cmp = icmp eq i32 %and, 0
%ext = sext i1 %cmp to i32
ret i32 %ext
}
define i32 @test14(i16 %x) {
; CHECK-LABEL: @test14(
; CHECK-NEXT: [[AND:%.*]] = lshr i16 %x, 4
; CHECK-NEXT: [[TMP1:%.*]] = and i16 [[AND]], 1
; CHECK-NEXT: [[SEXT:%.*]] = add nsw i16 [[TMP1]], -1
; CHECK-NEXT: [[EXT:%.*]] = sext i16 [[SEXT]] to i32
; CHECK-NEXT: ret i32 [[EXT]]
;
%and = and i16 %x, 16
%cmp = icmp ne i16 %and, 16
%ext = sext i1 %cmp to i32
ret i32 %ext
}
define i32 @test15(i32 %x) {
; CHECK-LABEL: @test15(
; CHECK-NEXT: [[TMP1:%.*]] = shl i32 %x, 27
; CHECK-NEXT: [[SEXT:%.*]] = ashr i32 [[TMP1]], 31
; CHECK-NEXT: ret i32 [[SEXT]]
;
%and = and i32 %x, 16
%cmp = icmp ne i32 %and, 0
%ext = sext i1 %cmp to i32
ret i32 %ext
}
define i32 @test16(i16 %x) {
; CHECK-LABEL: @test16(
; CHECK-NEXT: [[TMP1:%.*]] = shl i16 %x, 12
; CHECK-NEXT: [[SEXT:%.*]] = ashr i16 [[TMP1]], 15
; CHECK-NEXT: [[EXT:%.*]] = sext i16 [[SEXT]] to i32
; CHECK-NEXT: ret i32 [[EXT]]
;
%and = and i16 %x, 8
%cmp = icmp eq i16 %and, 8
%ext = sext i1 %cmp to i32
ret i32 %ext
}
define i32 @test17(i1 %x) {
; CHECK-LABEL: @test17(
; CHECK-NEXT: [[C2:%.*]] = zext i1 %x to i32
; CHECK-NEXT: ret i32 [[C2]]
;
%c1 = sext i1 %x to i32
%c2 = sub i32 0, %c1
ret i32 %c2
}
define i32 @test18(i16 %x) {
; CHECK-LABEL: @test18(
; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i16 %x, 0
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[TMP1]], i16 %x, i16 0
; CHECK-NEXT: [[TMP2:%.*]] = zext i16 [[SEL]] to i32
; CHECK-NEXT: ret i32 [[TMP2]]
;
%cmp = icmp slt i16 %x, 0
%sel = select i1 %cmp, i16 0, i16 %x
%ext = sext i16 %sel to i32
ret i32 %ext
}
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