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https://github.com/c64scene-ar/llvm-6502.git
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ddc693bd22
On x86-32, structure return via sret lets the callee pop the hidden pointer argument off the stack, which the caller then re-pushes. However if the calling convention is fastcc, then a register is used instead, and the caller should not adjust the stack. This is implemented with a check of IsTailCallConvention X86TargetLowering::LowerCall but is now checked properly in X86FastISel::DoSelectCall. (this time, actually commit what was reviewed!) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155825 91177308-0d34-0410-b5e6-96231b3b80d8
63 lines
1.5 KiB
LLVM
63 lines
1.5 KiB
LLVM
; RUN: llc -fast-isel -O0 -mcpu=generic -mtriple=i386-apple-darwin10 -relocation-model=pic < %s | FileCheck %s
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; This should use flds to set the return value.
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; CHECK: test0:
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; CHECK: flds
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; CHECK: ret
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@G = external global float
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define float @test0() nounwind {
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%t = load float* @G
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ret float %t
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}
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; This should pop 4 bytes on return.
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; CHECK: test1:
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; CHECK: ret $4
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define void @test1({i32, i32, i32, i32}* sret %p) nounwind {
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store {i32, i32, i32, i32} zeroinitializer, {i32, i32, i32, i32}* %p
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ret void
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}
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; Properly initialize the pic base.
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; CHECK: test2:
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; CHECK-NOT: HHH
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; CHECK: call{{.*}}L2$pb
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; CHECK-NEXT: L2$pb:
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; CHECK-NEXT: pop
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; CHECK: HHH
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; CHECK: ret
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@HHH = external global i32
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define i32 @test2() nounwind {
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%t = load i32* @HHH
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ret i32 %t
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}
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; Check that we fast-isel sret, and handle the callee-pops behavior correctly.
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%struct.a = type { i64, i64, i64 }
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define void @test3() nounwind ssp {
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entry:
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%tmp = alloca %struct.a, align 8
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call void @test3sret(%struct.a* sret %tmp)
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ret void
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; CHECK: test3:
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; CHECK: subl $44
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; CHECK: leal 16(%esp)
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; CHECK: calll _test3sret
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; CHECK: addl $40
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}
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declare void @test3sret(%struct.a* sret)
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; Check that fast-isel sret works with fastcc (and does not callee-pop)
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define void @test4() nounwind ssp {
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entry:
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%tmp = alloca %struct.a, align 8
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call fastcc void @test4fastccsret(%struct.a* sret %tmp)
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ret void
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; CHECK: test4:
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; CHECK: subl $28
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; CHECK: leal (%esp), %ecx
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; CHECK: calll _test4fastccsret
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; CHECK addl $28
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}
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declare fastcc void @test4fastccsret(%struct.a* sret)
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