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https://github.com/c64scene-ar/llvm-6502.git
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41 lines
1.2 KiB
LLVM
41 lines
1.2 KiB
LLVM
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; RUN: opt -simplifycfg -S %s | FileCheck %s
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; Make sure we don't speculate loads under ThreadSanitizer.
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@g = global i32 0, align 4
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define i32 @TestNoTsan(i32 %cond) nounwind readonly uwtable {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %return, label %if.then
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if.then: ; preds = %entry
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%0 = load i32* @g, align 4
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br label %return
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return: ; preds = %entry, %if.then
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%retval = phi i32 [ %0, %if.then ], [ 0, %entry ]
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ret i32 %retval
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; CHECK-LABEL: @TestNoTsan
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; CHECK: %[[LOAD:[^ ]*]] = load
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; CHECK: select{{.*}}[[LOAD]]
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; CHECK: ret i32
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}
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define i32 @TestTsan(i32 %cond) nounwind readonly uwtable sanitize_thread {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %return, label %if.then
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if.then: ; preds = %entry
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%0 = load i32* @g, align 4
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br label %return
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return: ; preds = %entry, %if.then
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%retval = phi i32 [ %0, %if.then ], [ 0, %entry ]
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ret i32 %retval
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; CHECK-LABEL: @TestTsan
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; CHECK: br i1
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; CHECK: load i32* @g
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; CHECK: br label
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; CHECK: ret i32
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}
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