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fast-isel sret calls, try 2. We actually do need to do something on x86-32. rdar://problem/9303592 .

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llvm-svn: 130429
This commit is contained in:
Eli Friedman 2011-04-28 20:19:12 +00:00
parent 6c39b65886
commit afc21e9be2
3 changed files with 32 additions and 2 deletions
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6
lib/Target/X86/X86FastISel.cpp
View File

@ -1618,7 +1618,6 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
// FIXME: Only handle *easy* calls for now.
if (CS.paramHasAttr(AttrInd, Attribute::InReg) ||
CS.paramHasAttr(AttrInd, Attribute::StructRet) ||
CS.paramHasAttr(AttrInd, Attribute::Nest) ||
CS.paramHasAttr(AttrInd, Attribute::ByVal))
return false;
@ -1811,8 +1810,11 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
// Issue CALLSEQ_END
unsigned AdjStackUp = TM.getRegisterInfo()->getCallFrameDestroyOpcode();
unsigned NumBytesCallee = 0;
if (!Subtarget->is64Bit() && CS.paramHasAttr(1, Attribute::StructRet))
NumBytesCallee = 4;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(AdjStackUp))
.addImm(NumBytes).addImm(0);
.addImm(NumBytes).addImm(NumBytesCallee);
// Now handle call return value (if any).
SmallVector<unsigned, 4> UsedRegs;

13
test/CodeGen/X86/fast-isel-x86-64.ll
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@ -239,6 +239,19 @@ define void @test19(double* %p1) {
; CHECK: pxor
}
; Check that we fast-isel sret
%struct.a = type { i64, i64, i64 }
define void @test20() nounwind ssp {
entry:
%tmp = alloca %struct.a, align 8
call void @test20sret(%struct.a* sret %tmp)
ret void
; CHECK: test20:
; CHECK: leaq (%rsp), %rdi
; CHECK: callq _test20sret
}
declare void @test20sret(%struct.a* sret)
; Check that -0.0 is not materialized using pxor
define void @test21(double* %p1) {
store double -0.0, double* %p1

15
test/CodeGen/X86/fast-isel-x86.ll
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@ -31,3 +31,18 @@ define i32 @test2() nounwind {
%t = load i32* @HHH
ret i32 %t
}
; Check that we fast-isel sret, and handle the callee-pops behavior correctly.
%struct.a = type { i64, i64, i64 }
define void @test3() nounwind ssp {
entry:
%tmp = alloca %struct.a, align 8
call void @test3sret(%struct.a* sret %tmp)
ret void
; CHECK: test3:
; CHECK: subl $44
; CHECK: leal 16(%esp)
; CHECK: calll _test3sret
; CHECK: addl $40
}
declare void @test3sret(%struct.a* sret)