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Change callbr to only define its output SSA variable on the normal
path, not the indirect targets. Fixes: PR45565. Differential Revision: https://reviews.llvm.org/D78341
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Original file line number | Diff line number | Diff line change |
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;; RUN: opt -S -codegenprepare < %s | FileCheck %s | ||
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;; Ensure that codegenprepare (via InstSimplify) doesn't eliminate the | ||
;; phi here (which would cause a module verification error). | ||
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;; CHECK: phi | ||
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" | ||
target triple = "x86_64-unknown-linux-gnu" | ||
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declare void @foo(i32) | ||
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define dso_local i32 @futex_lock_pi_atomic() local_unnamed_addr { | ||
entry: | ||
%0 = callbr i32 asm "", "=r,X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@futex_lock_pi_atomic, %b.exit)) | ||
to label %asm.fallthrough.i [label %b.exit] | ||
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asm.fallthrough.i: | ||
br label %b.exit | ||
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b.exit: | ||
%g.0 = phi i32 [ %0, %asm.fallthrough.i ], [ undef, %entry ] | ||
tail call void @foo(i32 %g.0) | ||
ret i32 undef | ||
} | ||
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