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Cherry-pick a fix for LLVM issue 40289 #135

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Jan 15, 2019
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Cherry-pick a fix for LLVM issue 40289 #135

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3 changes: 2 additions & 1 deletion lib/Target/X86/X86FrameLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,8 @@ static unsigned findDeadCallerSavedReg(MachineBasicBlock &MBB,
}

for (auto CS : AvailableRegs)
if (!Uses.count(CS) && CS != X86::RIP)
if (!Uses.count(CS) && CS != X86::RIP && CS != X86::RSP &&
CS != X86::ESP)
return CS;
}
}
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9 changes: 9 additions & 0 deletions test/CodeGen/X86/pr40289-64bit.ll
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@@ -0,0 +1,9 @@
; RUN: llc < %s -mtriple=x86_64-pc-windows-msvc | FileCheck %s

define cc 92 < 9 x i64 > @clobber() {
%1 = alloca i64
%2 = load volatile i64, i64* %1
; CHECK-NOT: popq %rsp
; CHECK: addq $8, %rsp
ret < 9 x i64 > undef
}
9 changes: 9 additions & 0 deletions test/CodeGen/X86/pr40289.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
; RUN: llc < %s -mtriple=i686-pc-windows-msvc | FileCheck %s

define < 3 x i32 > @clobber() {
%1 = alloca i32
%2 = load volatile i32, i32* %1
; CHECK-NOT: popl %esp
; CHECK: addl $4, %esp
ret < 3 x i32 > undef
}