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65 lines
1.2 KiB
LLVM
65 lines
1.2 KiB
LLVM
; RUN: opt < %s -basicaa -sink -S | FileCheck %s
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@A = external global i32
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@B = external global i32
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; Sink should sink the load past the store (which doesn't overlap) into
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; the block that uses it.
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; CHECK: @foo
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; CHECK: true:
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; CHECK-NEXT: %l = load i32* @A
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; CHECK-NEXT: ret i32 %l
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define i32 @foo(i1 %z) {
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%l = load i32* @A
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store i32 0, i32* @B
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br i1 %z, label %true, label %false
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true:
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ret i32 %l
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false:
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ret i32 0
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}
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; But don't sink load volatiles...
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; CHECK: @foo2
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; CHECK: load volatile
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; CHECK-NEXT: store i32
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define i32 @foo2(i1 %z) {
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%l = load volatile i32* @A
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store i32 0, i32* @B
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br i1 %z, label %true, label %false
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true:
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ret i32 %l
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false:
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ret i32 0
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}
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; Sink to the nearest post-dominator
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; CHECK: @diamond
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; CHECK: X:
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; CHECK-NEXT: phi
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; CHECK-NEXT: mul nsw
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; CHECK-NEXT: sub
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define i32 @diamond(i32 %a, i32 %b, i32 %c) {
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%1 = mul nsw i32 %c, %b
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%2 = icmp sgt i32 %a, 0
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br i1 %2, label %B0, label %B1
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B0: ; preds = %0
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br label %X
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B1: ; preds = %0
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br label %X
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X: ; preds = %5, %3
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%.01 = phi i32 [ %c, %B0 ], [ %a, %B1 ]
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%R = sub i32 %1, %.01
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ret i32 %R
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}
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