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Reset the virtual registers in liveins when clearing the virtual registers.

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This commit zeroes out the virtual register references in the machine
function's liveins in the class 'MachineRegisterInfo' when the virtual
register definitions are cleared.

Reviewers: Matthias Braun


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243290 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alex Lorenz 2015-07-27 17:51:59 +00:00
parent a5da4f1f8d
commit 6c304ebd8a
2 changed files with 21 additions and 0 deletions
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2
lib/CodeGen/MachineRegisterInfo.cpp
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@ -116,6 +116,8 @@ void MachineRegisterInfo::clearVirtRegs() {
}
#endif
VRegInfo.clear();
for (auto &I : LiveIns)
I.second = 0;
}
void MachineRegisterInfo::verifyUseList(unsigned Reg) const {

19
test/CodeGen/X86/virtual-registers-cleared-in-machine-functions-liveins.ll Normal file
View File

@ -0,0 +1,19 @@
; RUN: llc -march=x86-64 -o /dev/null -stop-after machine-scheduler %s | FileCheck %s --check-prefix=PRE-RA
; RUN: llc -march=x86-64 -o /dev/null -stop-after prologepilog %s | FileCheck %s --check-prefix=POST-RA
; This test verifies that the virtual register references in machine function's
; liveins are cleared after register allocation.
define i32 @test(i32 %a, i32 %b) {
body:
%c = mul i32 %a, %b
ret i32 %c
}
; PRE-RA: liveins:
; PRE-RA-NEXT: - { reg: '%edi', virtual-reg: '%0' }
; PRE-RA-NEXT: - { reg: '%esi', virtual-reg: '%1' }
; POST-RA: liveins:
; POST-RA-NEXT: - { reg: '%edi' }
; POST-RA-NEXT: - { reg: '%esi' }