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Please see include/llvm/Transforms/Utils/MemorySSA.h for a description of MemorySSA, and what it does. Differential Revision: http://reviews.llvm.org/D7864 llvm-svn: 259595
43 lines
1.6 KiB
LLVM
43 lines
1.6 KiB
LLVM
; RUN: opt -basicaa -print-memoryssa -analyze -verify-memoryssa < %s 2>&1 | FileCheck %s
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;
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; This test ensures we don't end up with multiple reaching defs for a single
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; use/phi edge If we were to optimize defs, we would end up with 2=
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; MemoryDef(liveOnEntry) and 4 = MemoryDef(liveOnEntry) Both would mean both
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; 1,2, and 3,4 would reach the phi node. Because the phi node can only have one
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; entry on each edge, it would choose 2, 4 and disconnect 1 and 3 completely
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; from the SSA graph, even though they are not dead
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define void @sink_store(i32 %index, i32* %foo, i32* %bar) {
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entry:
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%cmp = trunc i32 %index to i1
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br i1 %cmp, label %if.then, label %if.else
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if.then: ; preds = %entry
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: store i32 %index, i32* %foo, align 4
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store i32 %index, i32* %foo, align 4
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; CHECK: 2 = MemoryDef(1)
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; CHECK-NEXT: store i32 %index, i32* %bar, align 4
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store i32 %index, i32* %bar, align 4
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br label %if.end
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if.else: ; preds = %entry
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; CHECK: 3 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: store i32 %index, i32* %foo, align 4
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store i32 %index, i32* %foo, align 4
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; CHECK: 4 = MemoryDef(3)
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; CHECK-NEXT: store i32 %index, i32* %bar, align 4
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store i32 %index, i32* %bar, align 4
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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; CHECK: 5 = MemoryPhi({if.then,2},{if.else,4})
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; CHECK: MemoryUse(5)
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; CHECK-NEXT: %c = load i32, i32* %foo
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%c = load i32, i32* %foo
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; CHECK: MemoryUse(5)
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; CHECK-NEXT: %d = load i32, i32* %bar
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%d = load i32, i32* %bar
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ret void
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}
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