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Adding support for Microsoft's thiscall calling convention. LLVM side of the patch.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151123 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Aaron Ballman 2012-02-22 03:04:40 +00:00
parent 967570f2ec
commit 57708abb10
2 changed files with 49 additions and 2 deletions
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4
lib/Target/X86/X86CallingConv.td
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@ -331,8 +331,8 @@ def CC_X86_32_ThisCall : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// The 'nest' parameter, if any, is passed in EAX.
CCIfNest<CCAssignToReg<[EAX]>>,
// Pass sret arguments indirectly through EAX
CCIfSRet<CCAssignToReg<[EAX]>>,
// The first integer argument is passed in ECX
CCIfType<[i32], CCAssignToReg<[ECX]>>,

47
test/CodeGen/X86/thiscall-struct-return.ll Normal file
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@ -0,0 +1,47 @@
; RUN: llc < %s -mtriple=i386-PC-Win32 | FileCheck %s
%class.C = type { i8 }
%struct.S = type { i32 }
%struct.M = type { i32, i32 }
declare void @_ZN1CC1Ev(%class.C* %this) unnamed_addr nounwind align 2
declare x86_thiscallcc void @_ZNK1C5SmallEv(%struct.S* noalias sret %agg.result, %class.C* %this) nounwind align 2
declare x86_thiscallcc void @_ZNK1C6MediumEv(%struct.M* noalias sret %agg.result, %class.C* %this) nounwind align 2
define void @testv() nounwind {
; CHECK: testv:
; CHECK: leal
; CHECK-NEXT: movl %esi, (%esp)
; CHECK-NEXT: calll _ZN1CC1Ev
; CHECK: leal 8(%esp), %eax
; CHECK-NEXT: movl %esi, %ecx
; CHECK-NEXT: calll _ZNK1C5SmallEv
entry:
%c = alloca %class.C, align 1
%tmp = alloca %struct.S, align 4
call void @_ZN1CC1Ev(%class.C* %c)
; This call should put the return structure as a pointer
; into EAX instead of returning directly in EAX. The this
; pointer should go into ECX
call x86_thiscallcc void @_ZNK1C5SmallEv(%struct.S* sret %tmp, %class.C* %c)
ret void
}
define void @test2v() nounwind {
; CHECK: test2v:
; CHECK: leal
; CHECK-NEXT: movl %esi, (%esp)
; CHECK-NEXT: calll _ZN1CC1Ev
; CHECK: leal 8(%esp), %eax
; CHECK-NEXT: movl %esi, %ecx
; CHECK-NEXT: calll _ZNK1C6MediumEv
entry:
%c = alloca %class.C, align 1
%tmp = alloca %struct.M, align 4
call void @_ZN1CC1Ev(%class.C* %c)
; This call should put the return structure as a pointer
; into EAX instead of returning directly in EAX/EDX. The this
; pointer should go into ECX
call x86_thiscallcc void @_ZNK1C6MediumEv(%struct.M* sret %tmp, %class.C* %c)
ret void
}