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Fix PR2783 - coalescer bug. Missing a TargetRegisterInfo::isVirtualRegister check.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56112 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-09-11 18:40:32 +00:00
parent ffeecd65e3
commit 4086906a0f
2 changed files with 40 additions and 1 deletions
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3
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1319,7 +1319,8 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
// If resulting interval has a preference that no longer fits because of subreg
// coalescing, just clear the preference.
if (ResDstInt->preference && (isExtSubReg || isInsSubReg)) {
if (ResDstInt->preference && (isExtSubReg || isInsSubReg) &&
TargetRegisterInfo::isVirtualRegister(ResDstInt->reg)) {
const TargetRegisterClass *RC = mri_->getRegClass(ResDstInt->reg);
if (!RC->contains(ResDstInt->preference))
ResDstInt->preference = 0;

38
test/CodeGen/X86/2008-09-11-CoalescerBug.ll Normal file
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@ -0,0 +1,38 @@
; RUN: llvm-as < %s | llc -march=x86
; PR2783
@g_15 = external global i16 ; <i16*> [#uses=2]
define i32 @func_3(i32 %p_5) nounwind {
entry:
%0 = srem i32 1, 0 ; <i32> [#uses=2]
%1 = load i16* @g_15, align 2 ; <i16> [#uses=1]
%2 = zext i16 %1 to i32 ; <i32> [#uses=1]
%3 = and i32 %2, 1 ; <i32> [#uses=1]
%4 = tail call i32 (...)* @rshift_u_s( i32 1 ) nounwind ; <i32> [#uses=1]
%5 = icmp slt i32 %4, 2 ; <i1> [#uses=1]
%6 = zext i1 %5 to i32 ; <i32> [#uses=1]
%7 = icmp sge i32 %3, %6 ; <i1> [#uses=1]
%8 = zext i1 %7 to i32 ; <i32> [#uses=1]
%9 = load i16* @g_15, align 2 ; <i16> [#uses=1]
%10 = icmp eq i16 %9, 0 ; <i1> [#uses=1]
%11 = zext i1 %10 to i32 ; <i32> [#uses=1]
%12 = tail call i32 (...)* @func_20( i32 1 ) nounwind ; <i32> [#uses=1]
%13 = icmp sge i32 %11, %12 ; <i1> [#uses=1]
%14 = zext i1 %13 to i32 ; <i32> [#uses=1]
%15 = sub i32 %8, %14 ; <i32> [#uses=1]
%16 = icmp ult i32 %15, 2 ; <i1> [#uses=1]
%17 = zext i1 %16 to i32 ; <i32> [#uses=1]
%18 = icmp ugt i32 %0, 3 ; <i1> [#uses=1]
%or.cond = or i1 false, %18 ; <i1> [#uses=1]
%19 = select i1 %or.cond, i32 0, i32 %0 ; <i32> [#uses=1]
%.0 = lshr i32 %17, %19 ; <i32> [#uses=1]
%20 = tail call i32 (...)* @func_7( i32 %.0 ) nounwind ; <i32> [#uses=0]
ret i32 undef
}
declare i32 @rshift_u_s(...)
declare i32 @func_20(...)
declare i32 @func_7(...)