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84 lines
1.7 KiB
LLVM
84 lines
1.7 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK-LABEL: @sub1(
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; CHECK: %y = sub i32 0, %x
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; CHECK: %z = sdiv i32 %y, 337
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; CHECK: ret i32 %z
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define i32 @sub1(i32 %x) {
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%y = sub i32 0, %x
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%z = sdiv i32 %y, 337
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ret i32 %z
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}
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; CHECK-LABEL: @sub2(
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; CHECK: %z = sdiv i32 %x, -337
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; CHECK: ret i32 %z
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define i32 @sub2(i32 %x) {
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%y = sub nsw i32 0, %x
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%z = sdiv i32 %y, 337
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ret i32 %z
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}
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; CHECK-LABEL: @shl_icmp(
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; CHECK: %B = icmp eq i64 %X, 0
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; CHECK: ret i1 %B
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define i1 @shl_icmp(i64 %X) nounwind {
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%A = shl nuw i64 %X, 2 ; X/4
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%B = icmp eq i64 %A, 0
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ret i1 %B
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}
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; CHECK-LABEL: @shl1(
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; CHECK: %B = shl nuw nsw i64 %A, 8
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; CHECK: ret i64 %B
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define i64 @shl1(i64 %X, i64* %P) nounwind {
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%A = and i64 %X, 312
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store i64 %A, i64* %P ; multiple uses of A.
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%B = shl i64 %A, 8
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ret i64 %B
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}
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; CHECK-LABEL: @preserve1(
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; CHECK: add nsw i32 %x, 5
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define i32 @preserve1(i32 %x) nounwind {
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%add = add nsw i32 %x, 2
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%add3 = add nsw i32 %add, 3
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ret i32 %add3
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}
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; CHECK-LABEL: @nopreserve1(
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; CHECK: add i8 %x, -126
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define i8 @nopreserve1(i8 %x) nounwind {
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%add = add nsw i8 %x, 127
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%add3 = add nsw i8 %add, 3
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ret i8 %add3
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}
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; CHECK-LABEL: @nopreserve2(
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; CHECK: add i8 %x, 3
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define i8 @nopreserve2(i8 %x) nounwind {
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%add = add i8 %x, 1
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%add3 = add nsw i8 %add, 2
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ret i8 %add3
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}
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; CHECK-LABEL: @nopreserve3(
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; CHECK: add i8 %A, %B
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; CHECK: add i8
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define i8 @nopreserve3(i8 %A, i8 %B) nounwind {
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%x = add i8 %A, 10
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%y = add i8 %B, 10
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%add = add nsw i8 %x, %y
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ret i8 %add
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}
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; CHECK-LABEL: @nopreserve4(
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; CHECK: add i8 %A, %B
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; CHECK: add i8
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define i8 @nopreserve4(i8 %A, i8 %B) nounwind {
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%x = add nsw i8 %A, 10
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%y = add nsw i8 %B, 10
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%add = add nsw i8 %x, %y
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ret i8 %add
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}
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