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7b6a968f5d
instcombine xform to exercise this. Nothing forms exact udivs yet though. This is progress on PR8862 llvm-svn: 124992
61 lines
1.0 KiB
LLVM
61 lines
1.0 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK: define i32 @foo
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; CHECK: sdiv i32 %x, 8
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define i32 @foo(i32 %x) {
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%y = sdiv i32 %x, 8
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ret i32 %y
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}
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; CHECK: define i32 @bar
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; CHECK: ashr i32 %x, 3
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define i32 @bar(i32 %x) {
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%y = sdiv exact i32 %x, 8
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ret i32 %y
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}
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; CHECK: i32 @a0
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; CHECK: %y = srem i32 %x, 3
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; CHECK: %z = sub i32 %x, %y
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; CHECK: ret i32 %z
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define i32 @a0(i32 %x) {
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%y = sdiv i32 %x, 3
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%z = mul i32 %y, 3
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ret i32 %z
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}
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; CHECK: i32 @b0
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; CHECK: ret i32 %x
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define i32 @b0(i32 %x) {
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%y = sdiv exact i32 %x, 3
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%z = mul i32 %y, 3
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ret i32 %z
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}
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; CHECK: i32 @a1
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; CHECK: %y = srem i32 %x, 3
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; CHECK: %z = sub i32 %y, %x
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; CHECK: ret i32 %z
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define i32 @a1(i32 %x) {
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%y = sdiv i32 %x, 3
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%z = mul i32 %y, -3
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ret i32 %z
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}
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; CHECK: i32 @b1
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; CHECK: %z = sub i32 0, %x
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; CHECK: ret i32 %z
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define i32 @b1(i32 %x) {
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%y = sdiv exact i32 %x, 3
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%z = mul i32 %y, -3
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ret i32 %z
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}
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; CHECK: i32 @b2
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; CHECK: ret i32 %x
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define i32 @b2(i32 %x, i32 %w) {
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%y = udiv exact i32 %x, %w
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%z = mul i32 %y, %w
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ret i32 %z
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}
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