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4439f8e4ca
The X86 musttail implementation finds register parameters to forward by running the calling convention algorithm until a non-register location is returned. However, assigning a vector memory location has the side effect of increasing the function's stack alignment. We shouldn't increase the stack alignment when we are only looking for register parameters, so this change conditionalizes it. llvm-svn: 258442
187 lines
6.1 KiB
LLVM
187 lines
6.1 KiB
LLVM
; RUN: llc < %s -enable-tail-merge=0 -mtriple=x86_64-linux | FileCheck %s --check-prefix=LINUX
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; RUN: llc < %s -enable-tail-merge=0 -mtriple=x86_64-linux-gnux32 | FileCheck %s --check-prefix=LINUX-X32
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; RUN: llc < %s -enable-tail-merge=0 -mtriple=x86_64-windows | FileCheck %s --check-prefix=WINDOWS
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; RUN: llc < %s -enable-tail-merge=0 -mtriple=i686-windows | FileCheck %s --check-prefix=X86
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; RUN: llc < %s -enable-tail-merge=0 -mtriple=i686-windows -mattr=+sse2 | FileCheck %s --check-prefix=X86
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; Test that we actually spill and reload all arguments in the variadic argument
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; pack. Doing a normal call will clobber all argument registers, and we will
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; spill around it. A simple adjustment should not require any XMM spills.
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declare void @llvm.va_start(i8*) nounwind
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declare void(i8*, ...)* @get_f(i8* %this)
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define void @f_thunk(i8* %this, ...) {
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; Use va_start so that we exercise the combination.
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%ap = alloca [4 x i8*], align 16
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%ap_i8 = bitcast [4 x i8*]* %ap to i8*
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call void @llvm.va_start(i8* %ap_i8)
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%fptr = call void(i8*, ...)*(i8*) @get_f(i8* %this)
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musttail call void (i8*, ...) %fptr(i8* %this, ...)
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ret void
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}
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; Save and restore 6 GPRs, 8 XMMs, and AL around the call.
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; LINUX-LABEL: f_thunk:
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; LINUX-DAG: movq %rdi, {{.*}}
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; LINUX-DAG: movq %rsi, {{.*}}
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; LINUX-DAG: movq %rdx, {{.*}}
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; LINUX-DAG: movq %rcx, {{.*}}
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; LINUX-DAG: movq %r8, {{.*}}
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; LINUX-DAG: movq %r9, {{.*}}
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; LINUX-DAG: movb %al, {{.*}}
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; LINUX-DAG: movaps %xmm0, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm1, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm2, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm3, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm4, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm5, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm6, {{[0-9]*}}(%rsp)
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; LINUX-DAG: movaps %xmm7, {{[0-9]*}}(%rsp)
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; LINUX: callq get_f
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm0
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm1
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm2
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm3
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm4
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm5
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm6
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; LINUX-DAG: movaps {{[0-9]*}}(%rsp), %xmm7
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; LINUX-DAG: movq {{.*}}, %rdi
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; LINUX-DAG: movq {{.*}}, %rsi
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; LINUX-DAG: movq {{.*}}, %rdx
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; LINUX-DAG: movq {{.*}}, %rcx
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; LINUX-DAG: movq {{.*}}, %r8
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; LINUX-DAG: movq {{.*}}, %r9
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; LINUX-DAG: movb {{.*}}, %al
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; LINUX: jmpq *{{.*}} # TAILCALL
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; LINUX-X32-LABEL: f_thunk:
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; LINUX-X32-DAG: movl %edi, {{.*}}
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; LINUX-X32-DAG: movq %rsi, {{.*}}
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; LINUX-X32-DAG: movq %rdx, {{.*}}
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; LINUX-X32-DAG: movq %rcx, {{.*}}
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; LINUX-X32-DAG: movq %r8, {{.*}}
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; LINUX-X32-DAG: movq %r9, {{.*}}
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; LINUX-X32-DAG: movb %al, {{.*}}
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; LINUX-X32-DAG: movaps %xmm0, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm1, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm2, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm3, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm4, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm5, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm6, {{[0-9]*}}(%esp)
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; LINUX-X32-DAG: movaps %xmm7, {{[0-9]*}}(%esp)
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; LINUX-X32: callq get_f
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm0
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm1
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm2
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm3
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm4
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm5
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm6
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; LINUX-X32-DAG: movaps {{[0-9]*}}(%esp), %xmm7
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; LINUX-X32-DAG: movl {{.*}}, %edi
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; LINUX-X32-DAG: movq {{.*}}, %rsi
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; LINUX-X32-DAG: movq {{.*}}, %rdx
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; LINUX-X32-DAG: movq {{.*}}, %rcx
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; LINUX-X32-DAG: movq {{.*}}, %r8
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; LINUX-X32-DAG: movq {{.*}}, %r9
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; LINUX-X32-DAG: movb {{.*}}, %al
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; LINUX-X32: jmpq *{{.*}} # TAILCALL
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; WINDOWS-LABEL: f_thunk:
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; WINDOWS-NOT: mov{{.}}ps
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; WINDOWS-DAG: movq %rdx, {{.*}}
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; WINDOWS-DAG: movq %rcx, {{.*}}
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; WINDOWS-DAG: movq %r8, {{.*}}
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; WINDOWS-DAG: movq %r9, {{.*}}
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; WINDOWS-NOT: mov{{.}}ps
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; WINDOWS: callq get_f
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; WINDOWS-NOT: mov{{.}}ps
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; WINDOWS-DAG: movq {{.*}}, %rdx
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; WINDOWS-DAG: movq {{.*}}, %rcx
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; WINDOWS-DAG: movq {{.*}}, %r8
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; WINDOWS-DAG: movq {{.*}}, %r9
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; WINDOWS-NOT: mov{{.}}ps
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; WINDOWS: jmpq *{{.*}} # TAILCALL
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; No regparms on normal x86 conventions.
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; X86-LABEL: _f_thunk:
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; X86: calll _get_f
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; X86: jmpl *{{.*}} # TAILCALL
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; This thunk shouldn't require any spills and reloads, assuming the register
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; allocator knows what it's doing.
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define void @g_thunk(i8* %fptr_i8, ...) {
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%fptr = bitcast i8* %fptr_i8 to void (i8*, ...)*
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musttail call void (i8*, ...) %fptr(i8* %fptr_i8, ...)
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ret void
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}
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; LINUX-LABEL: g_thunk:
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; LINUX-NOT: movq
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; LINUX: jmpq *%rdi # TAILCALL
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; LINUX-X32-LABEL: g_thunk:
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; LINUX-X32-DAG: movl %edi, %[[REG:e[abcd]x|ebp|esi|edi|r8|r9|r1[0-5]]]
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; LINUX-X32-DAG: jmpq *%[[REG]] # TAILCALL
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; WINDOWS-LABEL: g_thunk:
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; WINDOWS-NOT: movq
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; WINDOWS: jmpq *%rcx # TAILCALL
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; X86-LABEL: _g_thunk:
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; X86-NOT: push %ebp
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; X86-NOT: andl {{.*}}, %esp
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; X86: jmpl *%eax # TAILCALL
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; Do a simple multi-exit multi-bb test.
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%struct.Foo = type { i1, i8*, i8* }
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@g = external global i32
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define void @h_thunk(%struct.Foo* %this, ...) {
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%cond_p = getelementptr %struct.Foo, %struct.Foo* %this, i32 0, i32 0
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%cond = load i1, i1* %cond_p
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br i1 %cond, label %then, label %else
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then:
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%a_p = getelementptr %struct.Foo, %struct.Foo* %this, i32 0, i32 1
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%a_i8 = load i8*, i8** %a_p
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%a = bitcast i8* %a_i8 to void (%struct.Foo*, ...)*
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musttail call void (%struct.Foo*, ...) %a(%struct.Foo* %this, ...)
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ret void
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else:
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%b_p = getelementptr %struct.Foo, %struct.Foo* %this, i32 0, i32 2
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%b_i8 = load i8*, i8** %b_p
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%b = bitcast i8* %b_i8 to void (%struct.Foo*, ...)*
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store i32 42, i32* @g
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musttail call void (%struct.Foo*, ...) %b(%struct.Foo* %this, ...)
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ret void
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}
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; LINUX-LABEL: h_thunk:
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; LINUX: jne
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; LINUX: jmpq *{{.*}} # TAILCALL
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; LINUX: jmpq *{{.*}} # TAILCALL
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; LINUX-X32-LABEL: h_thunk:
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; LINUX-X32: jne
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; LINUX-X32: jmpq *{{.*}} # TAILCALL
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; LINUX-X32: jmpq *{{.*}} # TAILCALL
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; WINDOWS-LABEL: h_thunk:
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; WINDOWS: jne
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; WINDOWS: jmpq *{{.*}} # TAILCALL
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; WINDOWS: jmpq *{{.*}} # TAILCALL
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; X86-LABEL: _h_thunk:
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; X86: jne
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; X86: jmpl *{{.*}} # TAILCALL
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; X86: jmpl *{{.*}} # TAILCALL
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