Add two new calling conventions for runtime calls

This patch adds two new target-independent calling conventions for runtime
calls - PreserveMost and PreserveAll.
The target-specific implementation for X86-64 is defined as following:
  - Arguments are passed as for the default C calling convention
  - The same applies for the return value(s)
  - PreserveMost preserves all GPRs - except R11
  - PreserveAll preserves all GPRs and all XMMs/YMMs - except R11

Reviewed by Lang and Philip

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199508 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/BitCodeFormat.rst b/docs/BitCodeFormat.rst
index 9363a62d0806b2730395bdf3e2f5bf73031c97ca..38b4010483a13b084b43cc3e12f13d822f057e6e 100644 (file)
--- a/docs/BitCodeFormat.rst
+++ b/docs/BitCodeFormat.rst
@@ -739,6 +739,8 @@ function. The operand fields are:
   * ``coldcc``: code 9
   * ``webkit_jscc``: code 12
   * ``anyregcc``: code 13
+  * ``preserve_mostcc``: code 14
+  * ``preserve_allcc``: code 15
   * ``x86_stdcallcc``: code 64
   * ``x86_fastcallcc``: code 65
   * ``arm_apcscc``: code 66

diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index d450b2a465f11f070b908617bc714a026a7a38c8..39948f4b083ce9ac0820be3b10aca260b09b0d8f 100644 (file)
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -359,6 +359,49 @@ added in the future:
     allocated. This can currently only be used with calls to
     llvm.experimental.patchpoint because only this intrinsic records
     the location of its arguments in a side table. See :doc:`StackMaps`.
+"``preserve_mostcc``" - The `PreserveMost` calling convention
+    This calling convention attempts to make the code in the caller as little
+    intrusive as possible. This calling convention behaves identical to the `C`
+    calling convention on how arguments and return values are passed, but it
+    uses a different set of caller/callee-saved registers. This alleviates the
+    burden of saving and recovering a large register set before and after the
+    call in the caller.
+
+    - On X86-64 the callee preserves all general purpose registers, except for
+      R11. R11 can be used as a scratch register. Floating-point registers
+      (XMMs/YMMs) are not preserved and need to be saved by the caller.
+
+    The idea behind this convention is to support calls to runtime functions
+    that have a hot path and a cold path. The hot path is usually a small piece
+    of code that doesn't many registers. The cold path might need to call out to
+    another function and therefore only needs to preserve the caller-saved
+    registers, which haven't already been saved by the caller.
+
+    This calling convention will be used by a future version of the ObjectiveC
+    runtime and should therefore still be considered experimental at this time.
+    Although this convention was created to optimize certain runtime calls to
+    the ObjectiveC runtime, it is not limited to this runtime and might be used
+    by other runtimes in the future too. The current implementation only
+    supports X86-64, but the intention is to support more architectures in the
+    future.
+"``preserve_allcc``" - The `PreserveAll` calling convention
+    This calling convention attempts to make the code in the caller even less
+    intrusive than the `PreserveMost` calling convention. This calling
+    convention also behaves identical to the `C` calling convention on how
+    arguments and return values are passed, but it uses a different set of
+    caller/callee-saved registers. This removes the burden of saving and
+    recovering a large register set before and after the call in the caller.
+
+    - On X86-64 the callee preserves all general purpose registers, except for
+      R11. R11 can be used as a scratch register. Furthermore it also preserves
+      all floating-point registers (XMMs/YMMs).
+
+    The idea behind this convention is to support calls to runtime functions
+    that don't need to call out to any other functions.
+
+    This calling convention, like the `PreserveMost` calling convention, will be
+    used by a future version of the ObjectiveC runtime and should be considered
+    experimental at this time.
 "``cc <n>``" - Numbered convention
     Any calling convention may be specified by number, allowing
     target-specific calling conventions to be used. Target specific

diff --git a/include/llvm/IR/CallingConv.h b/include/llvm/IR/CallingConv.h
index 4437af255748b8bc7450ee57c582266ee4f0d367..1eaf4f7f469fe8b252940e816655d971706ccdac 100644 (file)
--- a/include/llvm/IR/CallingConv.h
+++ b/include/llvm/IR/CallingConv.h
@@ -58,6 +58,14 @@ namespace CallingConv {
     // stackmap and patchpoint intrinsics).
     AnyReg = 13,
 
+    // PreserveMost - Calling convention for runtime calls that preserves most
+    // registers.
+    PreserveMost = 14,
+
+    // PreserveAll - Calling convention for runtime calls that preserves
+    // (almost) all registers.
+    PreserveAll = 15,
+
     // Target - This is the start of the target-specific calling conventions,
     // e.g. fastcall and thiscall on X86.
     FirstTargetCC = 64,

diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index ca3b7902b03bb95c88764ffc94d6b1ee7b2cc607..7fb8032ca99ab0d4638b3fac58be79d83d617b19 100644 (file)
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -563,6 +563,8 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(x86_64_win64cc);
   KEYWORD(webkit_jscc);
   KEYWORD(anyregcc);
+  KEYWORD(preserve_mostcc);
+  KEYWORD(preserve_allcc);
 
   KEYWORD(cc);
   KEYWORD(c);

diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index d4d6f7cee14ec0498df47104d13abec461ba60ca..a1b5f9946c96bbceee5ef05e516b378499d70804 100644 (file)
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -1369,6 +1369,8 @@ bool LLParser::ParseOptionalDLLStorageClass(unsigned &Res) {
 ///   ::= 'x86_64_win64cc'
 ///   ::= 'webkit_jscc'
 ///   ::= 'anyregcc'
+///   ::= 'preserve_mostcc'
+///   ::= 'preserve_allcc'
 ///   ::= 'cc' UINT
 ///
 bool LLParser::ParseOptionalCallingConv(CallingConv::ID &CC) {
@@ -1393,6 +1395,8 @@ bool LLParser::ParseOptionalCallingConv(CallingConv::ID &CC) {
   case lltok::kw_x86_64_win64cc: CC = CallingConv::X86_64_Win64; break;
   case lltok::kw_webkit_jscc:    CC = CallingConv::WebKit_JS; break;
   case lltok::kw_anyregcc:       CC = CallingConv::AnyReg; break;
+  case lltok::kw_preserve_mostcc:CC = CallingConv::PreserveMost; break;
+  case lltok::kw_preserve_allcc: CC = CallingConv::PreserveAll; break;
   case lltok::kw_cc: {
       unsigned ArbitraryCC;
       Lex.Lex();

diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index 5a6866dd14989cd94d0b993f9715c0605c4d7159..50318500bf4847b2aa47a05a2ceaf6786aca783c 100644 (file)
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -92,6 +92,7 @@ namespace lltok {
     kw_spir_kernel, kw_spir_func,
     kw_x86_64_sysvcc, kw_x86_64_win64cc,
     kw_webkit_jscc, kw_anyregcc,
+    kw_preserve_mostcc, kw_preserve_allcc,
 
     // Attributes:
     kw_attributes,

diff --git a/lib/IR/AsmWriter.cpp b/lib/IR/AsmWriter.cpp
index eba05c5f28e1f1d5bd207b54c831e48e3b4f3dfd..73b407ea1b41d629558fb3a04925c56883cfdfc0 100644 (file)
--- a/lib/IR/AsmWriter.cpp
+++ b/lib/IR/AsmWriter.cpp
@@ -73,6 +73,8 @@ static void PrintCallingConv(unsigned cc, raw_ostream &Out) {
   case CallingConv::Cold:          Out << "coldcc"; break;
   case CallingConv::WebKit_JS:     Out << "webkit_jscc"; break;
   case CallingConv::AnyReg:        Out << "anyregcc"; break;
+  case CallingConv::PreserveMost:  Out << "preserve_mostcc"; break;
+  case CallingConv::PreserveAll:   Out << "preserve_allcc"; break;
   case CallingConv::X86_StdCall:   Out << "x86_stdcallcc"; break;
   case CallingConv::X86_FastCall:  Out << "x86_fastcallcc"; break;
   case CallingConv::X86_ThisCall:  Out << "x86_thiscallcc"; break;

diff --git a/lib/Target/X86/X86CallingConv.td b/lib/Target/X86/X86CallingConv.td
index e733420e096ad0a652dcb7ea3dc8025325cad873..5b51a1e8e0b6d778eab96b97c39a0be8ce0e19db 100644 (file)
--- a/lib/Target/X86/X86CallingConv.td
+++ b/lib/Target/X86/X86CallingConv.td
@@ -620,6 +620,16 @@ def CSR_64EHRet : CalleeSavedRegs<(add RAX, RDX, CSR_64)>;
 def CSR_Win64 : CalleeSavedRegs<(add RBX, RBP, RDI, RSI, R12, R13, R14, R15,
                                      (sequence "XMM%u", 6, 15))>;
 
+// All GPRs - except r11
+def CSR_64_RT_MostRegs : CalleeSavedRegs<(add CSR_64, RAX, RCX, RDX, RSI, RDI,
+                                              R8, R9, R10, RSP)>;
+
+// All registers - except r11
+def CSR_64_RT_AllRegs     : CalleeSavedRegs<(add CSR_64_RT_MostRegs,
+                                                 (sequence "XMM%u", 0, 15))>;
+def CSR_64_RT_AllRegs_AVX : CalleeSavedRegs<(add CSR_64_RT_MostRegs,
+                                                 (sequence "YMM%u", 0, 15))>;
+
 def CSR_64_MostRegs : CalleeSavedRegs<(add RBX, RCX, RDX, RSI, RDI, R8, R9, R10,
                                            R11, R12, R13, R14, R15, RBP,
                                            (sequence "XMM%u", 0, 15))>;

diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index 220dc433fefc8add013294ae29c6852d74738e72..8a65dc1f2f7ae237869312df4aa541d846f51f0a 100644 (file)
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -245,6 +245,12 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
     if (HasAVX)
       return CSR_64_AllRegs_AVX_SaveList;
     return CSR_64_AllRegs_SaveList;
+  case CallingConv::PreserveMost:
+    return CSR_64_RT_MostRegs_SaveList;
+  case CallingConv::PreserveAll:
+    if (HasAVX)
+      return CSR_64_RT_AllRegs_AVX_SaveList;
+    return CSR_64_RT_AllRegs_SaveList;
   case CallingConv::Intel_OCL_BI: {
     if (HasAVX512 && IsWin64)
       return CSR_Win64_Intel_OCL_BI_AVX512_SaveList;
@@ -292,6 +298,12 @@ X86RegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
     if (HasAVX)
       return CSR_64_AllRegs_AVX_RegMask;
     return CSR_64_AllRegs_RegMask;
+  case CallingConv::PreserveMost:
+    return CSR_64_RT_MostRegs_RegMask;
+  case CallingConv::PreserveAll:
+    if (HasAVX)
+      return CSR_64_RT_AllRegs_AVX_RegMask;
+    return CSR_64_RT_AllRegs_RegMask;
   case CallingConv::Intel_OCL_BI: {
     if (IsWin64 && HasAVX512)
       return CSR_Win64_Intel_OCL_BI_AVX512_RegMask;

diff --git a/test/CodeGen/X86/preserve_allcc64.ll b/test/CodeGen/X86/preserve_allcc64.ll
new file mode 100644 (file)
index 0000000..545cd36
--- /dev/null
+++ b/test/CodeGen/X86/preserve_allcc64.ll
@@ -0,0 +1,104 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7     | FileCheck --check-prefix=SSE %s
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx | FileCheck --check-prefix=AVX %s
+
+define preserve_allcc void @preserve_allcc1() nounwind {
+entry:
+;SSE-LABEL: preserve_allcc1
+;SSE:       pushq %r10
+;SSE-NEXT:  pushq %r9
+;SSE-NEXT:  pushq %r8
+;SSE-NEXT:  pushq %rdi
+;SSE-NEXT:  pushq %rsi
+;SSE-NEXT:  pushq %rdx
+;SSE-NEXT:  pushq %rcx
+;SSE-NEXT:  pushq %rax
+;SSE-NEXT:  pushq %rbp
+;SSE-NEXT:  pushq %r15
+;SSE-NEXT:  pushq %r14
+;SSE-NEXT:  pushq %r13
+;SSE-NEXT:  pushq %r12
+;SSE-NEXT:  pushq %rbx
+;SSE:       movaps %xmm15
+;SSE-NEXT:  movaps %xmm14
+;SSE-NEXT:  movaps %xmm13
+;SSE-NEXT:  movaps %xmm12
+;SSE-NEXT:  movaps %xmm11
+;SSE-NEXT:  movaps %xmm10
+;SSE-NEXT:  movaps %xmm9
+;SSE-NEXT:  movaps %xmm8
+;SSE-NEXT:  movaps %xmm7
+;SSE-NEXT:  movaps %xmm6
+;SSE-NEXT:  movaps %xmm5
+;SSE-NEXT:  movaps %xmm4
+;SSE-NEXT:  movaps %xmm3
+;SSE-NEXT:  movaps %xmm2
+;SSE-NEXT:  movaps %xmm1
+;SSE-NEXT:  movaps %xmm0
+;AVX-LABEL: preserve_allcc1
+;AVX:       pushq %r10
+;AVX-NEXT:  pushq %r9
+;AVX-NEXT:  pushq %r8
+;AVX-NEXT:  pushq %rdi
+;AVX-NEXT:  pushq %rsi
+;AVX-NEXT:  pushq %rdx
+;AVX-NEXT:  pushq %rcx
+;AVX-NEXT:  pushq %rax
+;AVX-NEXT:  pushq %rbp
+;AVX-NEXT:  pushq %r15
+;AVX-NEXT:  pushq %r14
+;AVX-NEXT:  pushq %r13
+;AVX-NEXT:  pushq %r12
+;AVX-NEXT:  pushq %rbx
+;AVX:       vmovups %ymm15
+;AVX-NEXT:  vmovups %ymm14
+;AVX-NEXT:  vmovups %ymm13
+;AVX-NEXT:  vmovups %ymm12
+;AVX-NEXT:  vmovups %ymm11
+;AVX-NEXT:  vmovups %ymm10
+;AVX-NEXT:  vmovups %ymm9
+;AVX-NEXT:  vmovups %ymm8
+;AVX-NEXT:  vmovups %ymm7
+;AVX-NEXT:  vmovups %ymm6
+;AVX-NEXT:  vmovups %ymm5
+;AVX-NEXT:  vmovups %ymm4
+;AVX-NEXT:  vmovups %ymm3
+;AVX-NEXT:  vmovups %ymm2
+;AVX-NEXT:  vmovups %ymm1
+;AVX-NEXT:  vmovups %ymm0
+  call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{rbp},~{xmm0},~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{xmm8},~{xmm9},~{xmm10},~{xmm11},~{xmm12},~{xmm13},~{xmm14},~{xmm15}"()
+  ret void
+}
+
+; Make sure only R11 is saved before the call
+declare preserve_allcc void @bar(i64, i64, double, double)
+define void @preserve_allcc2() nounwind {
+entry:
+;SSE-LABEL: preserve_allcc2
+;SSE:       movq %r11, [[REG:%[a-z0-9]+]]
+;SSE-NOT:   movaps %xmm
+;SSE:       movq [[REG]], %r11
+  %a0 = call i64 asm sideeffect "", "={rax}"() nounwind
+  %a1 = call i64 asm sideeffect "", "={rcx}"() nounwind
+  %a2 = call i64 asm sideeffect "", "={rdx}"() nounwind
+  %a3 = call i64 asm sideeffect "", "={r8}"() nounwind
+  %a4 = call i64 asm sideeffect "", "={r9}"() nounwind
+  %a5 = call i64 asm sideeffect "", "={r10}"() nounwind
+  %a6 = call i64 asm sideeffect "", "={r11}"() nounwind
+  %a10 = call <2 x double> asm sideeffect "", "={xmm2}"() nounwind
+  %a11 = call <2 x double> asm sideeffect "", "={xmm3}"() nounwind
+  %a12 = call <2 x double> asm sideeffect "", "={xmm4}"() nounwind
+  %a13 = call <2 x double> asm sideeffect "", "={xmm5}"() nounwind
+  %a14 = call <2 x double> asm sideeffect "", "={xmm6}"() nounwind
+  %a15 = call <2 x double> asm sideeffect "", "={xmm7}"() nounwind
+  %a16 = call <2 x double> asm sideeffect "", "={xmm8}"() nounwind
+  %a17 = call <2 x double> asm sideeffect "", "={xmm9}"() nounwind
+  %a18 = call <2 x double> asm sideeffect "", "={xmm10}"() nounwind
+  %a19 = call <2 x double> asm sideeffect "", "={xmm11}"() nounwind
+  %a20 = call <2 x double> asm sideeffect "", "={xmm12}"() nounwind
+  %a21 = call <2 x double> asm sideeffect "", "={xmm13}"() nounwind
+  %a22 = call <2 x double> asm sideeffect "", "={xmm14}"() nounwind
+  %a23 = call <2 x double> asm sideeffect "", "={xmm15}"() nounwind
+  call preserve_allcc void @bar(i64 1, i64 2, double 3.0, double 4.0)
+  call void asm sideeffect "", "{rax},{rcx},{rdx},{r8},{r9},{r10},{r11},{xmm2},{xmm3},{xmm4},{xmm5},{xmm6},{xmm7},{xmm8},{xmm9},{xmm10},{xmm11},{xmm12},{xmm13},{xmm14},{xmm15}"(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, i64 %a5, i64 %a6, <2 x double> %a10, <2 x double> %a11, <2 x double> %a12, <2 x double> %a13, <2 x double> %a14, <2 x double> %a15, <2 x double> %a16, <2 x double> %a17, <2 x double> %a18, <2 x double> %a19, <2 x double> %a20, <2 x double> %a21, <2 x double> %a22, <2 x double> %a23)
+  ret void
+}

diff --git a/test/CodeGen/X86/preserve_mostcc64.ll b/test/CodeGen/X86/preserve_mostcc64.ll
new file mode 100644 (file)
index 0000000..4ee293e
--- /dev/null
+++ b/test/CodeGen/X86/preserve_mostcc64.ll
@@ -0,0 +1,86 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7     | FileCheck --check-prefix=SSE %s
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx | FileCheck --check-prefix=AVX %s
+
+; Every GPR should be saved - except r11
+define preserve_mostcc void @preserve_mostcc1() nounwind {
+entry:
+;SSE-LABEL: preserve_mostcc1
+;SSE:       pushq %r10
+;SSE-NEXT:  pushq %r9
+;SSE-NEXT:  pushq %r8
+;SSE-NEXT:  pushq %rdi
+;SSE-NEXT:  pushq %rsi
+;SSE-NEXT:  pushq %rdx
+;SSE-NEXT:  pushq %rcx
+;SSE-NEXT:  pushq %rax
+;SSE-NEXT:  pushq %rbp
+;SSE-NEXT:  pushq %r15
+;SSE-NEXT:  pushq %r14
+;SSE-NEXT:  pushq %r13
+;SSE-NEXT:  pushq %r12
+;SSE-NEXT:  pushq %rbx
+;AVX-LABEL: preserve_mostcc1
+;AVX:       pushq %r10
+;AVX-NEXT:  pushq %r9
+;AVX-NEXT:  pushq %r8
+;AVX-NEXT:  pushq %rdi
+;AVX-NEXT:  pushq %rsi
+;AVX-NEXT:  pushq %rdx
+;AVX-NEXT:  pushq %rcx
+;AVX-NEXT:  pushq %rax
+;AVX-NEXT:  pushq %rbp
+;AVX-NEXT:  pushq %r15
+;AVX-NEXT:  pushq %r14
+;AVX-NEXT:  pushq %r13
+;AVX-NEXT:  pushq %r12
+;AVX-NEXT:  pushq %rbx
+  call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{rbp},~{xmm0},~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{xmm8},~{xmm9},~{xmm10},~{xmm11},~{xmm12},~{xmm13},~{xmm14},~{xmm15}"()
+  ret void
+}
+
+; Make sure R11 and XMMs are saved before the call
+declare preserve_mostcc void @foo(i64, i64, double, double)
+define void @preserve_mostcc2() nounwind {
+entry:
+;SSE-LABEL: preserve_mostcc2
+;SSE:       movq %r11, [[REG:%[a-z0-9]+]]
+;SSE:       movaps %xmm2
+;SSE:       movaps %xmm3
+;SSE:       movaps %xmm4
+;SSE:       movaps %xmm5
+;SSE:       movaps %xmm6
+;SSE:       movaps %xmm7
+;SSE:       movaps %xmm8
+;SSE:       movaps %xmm9
+;SSE:       movaps %xmm10
+;SSE:       movaps %xmm11
+;SSE:       movaps %xmm12
+;SSE:       movaps %xmm13
+;SSE:       movaps %xmm14
+;SSE:       movaps %xmm15
+;SSE:       movq [[REG]], %r11
+  %a0 = call i64 asm sideeffect "", "={rax}"() nounwind
+  %a1 = call i64 asm sideeffect "", "={rcx}"() nounwind
+  %a2 = call i64 asm sideeffect "", "={rdx}"() nounwind
+  %a3 = call i64 asm sideeffect "", "={r8}"() nounwind
+  %a4 = call i64 asm sideeffect "", "={r9}"() nounwind
+  %a5 = call i64 asm sideeffect "", "={r10}"() nounwind
+  %a6 = call i64 asm sideeffect "", "={r11}"() nounwind
+  %a10 = call <2 x double> asm sideeffect "", "={xmm2}"() nounwind
+  %a11 = call <2 x double> asm sideeffect "", "={xmm3}"() nounwind
+  %a12 = call <2 x double> asm sideeffect "", "={xmm4}"() nounwind
+  %a13 = call <2 x double> asm sideeffect "", "={xmm5}"() nounwind
+  %a14 = call <2 x double> asm sideeffect "", "={xmm6}"() nounwind
+  %a15 = call <2 x double> asm sideeffect "", "={xmm7}"() nounwind
+  %a16 = call <2 x double> asm sideeffect "", "={xmm8}"() nounwind
+  %a17 = call <2 x double> asm sideeffect "", "={xmm9}"() nounwind
+  %a18 = call <2 x double> asm sideeffect "", "={xmm10}"() nounwind
+  %a19 = call <2 x double> asm sideeffect "", "={xmm11}"() nounwind
+  %a20 = call <2 x double> asm sideeffect "", "={xmm12}"() nounwind
+  %a21 = call <2 x double> asm sideeffect "", "={xmm13}"() nounwind
+  %a22 = call <2 x double> asm sideeffect "", "={xmm14}"() nounwind
+  %a23 = call <2 x double> asm sideeffect "", "={xmm15}"() nounwind
+  call preserve_mostcc void @foo(i64 1, i64 2, double 3.0, double 4.0)
+  call void asm sideeffect "", "{rax},{rcx},{rdx},{r8},{r9},{r10},{r11},{xmm2},{xmm3},{xmm4},{xmm5},{xmm6},{xmm7},{xmm8},{xmm9},{xmm10},{xmm11},{xmm12},{xmm13},{xmm14},{xmm15}"(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, i64 %a5, i64 %a6, <2 x double> %a10, <2 x double> %a11, <2 x double> %a12, <2 x double> %a13, <2 x double> %a14, <2 x double> %a15, <2 x double> %a16, <2 x double> %a17, <2 x double> %a18, <2 x double> %a19, <2 x double> %a20, <2 x double> %a21, <2 x double> %a22, <2 x double> %a23)
+  ret void
+}