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Fix a problem with fast-isel return values introduced in r134018.

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We would put the return value from long double functions in the wrong
register.

This fixes gcc.c-torture/execute/conversion.c

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134205 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-06-30 23:42:18 +00:00
parent 2a7b41ba4d
commit 098c7ac7c8
2 changed files with 27 additions and 2 deletions
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5
lib/Target/X86/X86FastISel.cpp
View File

@ -1849,9 +1849,10 @@ bool X86FastISel::DoSelectCall(const Instruction *I, const char *MemIntName) {
// out as F80 and use a truncate to move it from fp stack reg to xmm reg.
if ((RVLocs[i].getLocReg() == X86::ST0 ||
RVLocs[i].getLocReg() == X86::ST1)) {
if (isScalarFPTypeInSSEReg(RVLocs[i].getValVT()))
if (isScalarFPTypeInSSEReg(RVLocs[i].getValVT())) {
CopyVT = MVT::f80;
CopyReg = createResultReg(X86::RFP80RegisterClass);
CopyReg = createResultReg(X86::RFP80RegisterClass);
}
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::FpPOP_RETVAL),
CopyReg);
} else {

24
test/CodeGen/X86/fp-stack-O0.ll Normal file
View File

@ -0,0 +1,24 @@
; RUN: llc < %s -O0 | FileCheck %s
target triple = "x86_64-apple-macosx"
declare x86_fp80 @x1(i32) nounwind
declare i32 @x2(x86_fp80, x86_fp80) nounwind
; Keep track of the return value.
; CHECK: test1
; CHECK: x1
; Pass arguments on the stack.
; CHECK-NEXT: movq %rsp, [[RCX:%r..]]
; Copy constant-pool value.
; CHECK-NEXT: fldt LCPI
; CHECK-NEXT: fstpt 16([[RCX]])
; Copy x1 return value.
; CHECK-NEXT: fstpt ([[RCX]])
; CHECK-NEXT: x2
define i32 @test1() nounwind uwtable ssp {
entry:
%call = call x86_fp80 (...)* bitcast (x86_fp80 (i32)* @x1 to x86_fp80 (...)*)(i32 -1)
%call1 = call i32 @x2(x86_fp80 %call, x86_fp80 0xK401EFFFFFFFF00000000)
ret i32 %call1
}