50 lines
1.3 KiB
LLVM
50 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i64 @test1(i32 %x) nounwind {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: ret i64 0
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;
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%y = lshr i32 %x, 1
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%r = udiv i32 %y, -1
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%z = sext i32 %r to i64
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ret i64 %z
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}
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define i64 @test2(i32 %x) nounwind {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: ret i64 0
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;
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%y = lshr i32 %x, 31
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%r = udiv i32 %y, 3
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%z = sext i32 %r to i64
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ret i64 %z
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}
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; The udiv instructions shouldn't be optimized away, and the
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; sext instructions should be optimized to zext.
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define i64 @test1_PR2274(i32 %x, i32 %g) nounwind {
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; CHECK-LABEL: @test1_PR2274(
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; CHECK-NEXT: [[Y:%.*]] = lshr i32 %x, 30
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; CHECK-NEXT: [[R:%.*]] = udiv i32 [[Y]], %g
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; CHECK-NEXT: [[Z1:%.*]] = zext i32 [[R]] to i64
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; CHECK-NEXT: ret i64 [[Z1]]
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;
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%y = lshr i32 %x, 30
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%r = udiv i32 %y, %g
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%z = sext i32 %r to i64
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ret i64 %z
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}
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define i64 @test2_PR2274(i32 %x, i32 %v) nounwind {
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; CHECK-LABEL: @test2_PR2274(
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; CHECK-NEXT: [[Y:%.*]] = lshr i32 %x, 31
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; CHECK-NEXT: [[R:%.*]] = udiv i32 [[Y]], %v
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; CHECK-NEXT: [[Z1:%.*]] = zext i32 [[R]] to i64
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; CHECK-NEXT: ret i64 [[Z1]]
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;
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%y = lshr i32 %x, 31
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%r = udiv i32 %y, %v
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%z = sext i32 %r to i64
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ret i64 %z
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}
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