forked from OSchip/llvm-project
49 lines
1.1 KiB
LLVM
49 lines
1.1 KiB
LLVM
; RUN: opt -codegenprepare -S -mtriple=x86_64-linux < %s | FileCheck %s
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; The ret instruction can be duplicated into BB case2 even though there is an
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; intermediate BB exit1 and call to llvm.assume.
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@ptr = external global i8*, align 8
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; CHECK: %ret1 = tail call i8* @qux()
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; CHECK-NEXT: ret i8* %ret1
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; CHECK: %ret2 = tail call i8* @bar()
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; CHECK-NEXT: ret i8* %ret2
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define i8* @foo(i64 %size, i64 %v1, i64 %v2) {
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entry:
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%cmp1 = icmp ult i64 %size, 1025
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br i1 %cmp1, label %if.end, label %case1
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case1:
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%ret1 = tail call i8* @qux()
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br label %exit2
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if.end:
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%cmp2 = icmp ult i64 %v1, %v2
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br i1 %cmp2, label %case3, label %case2
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case2:
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%ret2 = tail call i8* @bar()
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br label %exit1
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case3:
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%ret3 = load i8*, i8** @ptr, align 8
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br label %exit1
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exit1:
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%retval1 = phi i8* [ %ret2, %case2 ], [ %ret3, %case3 ]
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%cmp3 = icmp ne i8* %retval1, null
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tail call void @llvm.assume(i1 %cmp3)
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br label %exit2
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exit2:
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%retval2 = phi i8* [ %ret1, %case1 ], [ %retval1, %exit1 ]
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ret i8* %retval2
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}
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declare void @llvm.assume(i1)
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declare i8* @qux()
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declare i8* @bar()
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