derek.holloway
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40 lines
1.8 KiB
LLVM
40 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt -S < %s | FileCheck %s
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; RUN: opt -S -passes=instcombine < %s | FileCheck %s --check-prefix=INSTCOMBINE
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; Two of the llvm.umax calls are intentionally missing the mangling suffix here,
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; to show that it will be added automatically.
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define i32 @test(i8 %x, i8 %y) {
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; CHECK-LABEL: define i32 @test(
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; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X]], -1
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[MAX1:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
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; CHECK-NEXT: [[X_EXT:%.*]] = zext i8 [[X]] to i16
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; CHECK-NEXT: [[Y_EXT:%.*]] = zext i8 [[Y]] to i16
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; CHECK-NEXT: [[MAX2:%.*]] = call i16 @llvm.umax.i16(i16 [[X_EXT]], i16 [[Y_EXT]])
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; CHECK-NEXT: [[X_EXT2:%.*]] = zext i8 [[X]] to i32
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; CHECK-NEXT: [[Y_EXT2:%.*]] = zext i8 [[Y]] to i32
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; CHECK-NEXT: [[MAX3:%.*]] = call i32 @llvm.umax.i32(i32 [[X_EXT2]], i32 [[Y_EXT2]])
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; CHECK-NEXT: ret i32 [[MAX3]]
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;
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; INSTCOMBINE-LABEL: define i32 @test(
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; INSTCOMBINE-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
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; INSTCOMBINE-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X]], -1
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; INSTCOMBINE-NEXT: call void @llvm.assume(i1 [[CMP]])
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; INSTCOMBINE-NEXT: [[TMP1:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
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; INSTCOMBINE-NEXT: [[MAX3:%.*]] = zext i8 [[TMP1]] to i32
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; INSTCOMBINE-NEXT: ret i32 [[MAX3]]
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;
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%cmp = icmp sgt i8 %x, -1
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call void @llvm.assume(i1 %cmp)
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%max1 = call i8 @llvm.umax(i8 %x, i8 %y)
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%x.ext = zext i8 %x to i16
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%y.ext = zext i8 %y to i16
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%max2 = call i16 @llvm.umax(i16 %x.ext, i16 %y.ext)
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%x.ext2 = zext i8 %x to i32
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%y.ext2 = zext i8 %y to i32
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%max3 = call i32 @llvm.umax.i32(i32 %x.ext2, i32 %y.ext2)
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ret i32 %max3
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}
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