[Differential] D84041: [AArch64][SVE] Fix PCS for functions taking/returning scalable types.

[Sander de Smalen via llvm-commits]

This revision was not accepted when it landed; it landed in state "Needs Review".
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG9bacf1588583: [AArch64][SVE] Fix PCS for functions taking/returning scalable types. (authored by sdesmalen).

Changed prior to commit:
  https://reviews.llvm.org/D84041?vs=278806&id=279049#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D84041/new/


  https://reviews.llvm.org/D84041

Files:
  llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
  llvm/test/CodeGen/AArch64/sve-calling-convention.ll
  llvm/test/CodeGen/AArch64/sve-trunc.ll



Index: llvm/test/CodeGen/AArch64/sve-trunc.ll
===================================================================
--- llvm/test/CodeGen/AArch64/sve-trunc.ll
+++ llvm/test/CodeGen/AArch64/sve-trunc.ll
@@ -113,6 +113,12 @@
 define <vscale x 16 x i1> @trunc_i64toi1_split3(<vscale x 16 x i64> %in) {
 ; CHECK-LABEL: trunc_i64toi1_split3:
 ; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    str x29, [sp, #-16]! // 8-byte Folded Spill
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    str p4, [sp, #7, mul vl] // 2-byte Folded Spill
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    .cfi_offset p4, -16
+; CHECK-NEXT:    .cfi_offset w29, -16
 ; CHECK-NEXT:    ptrue p0.d
 ; CHECK-NEXT:    and z7.d, z7.d, #0x1
 ; CHECK-NEXT:    and z6.d, z6.d, #0x1
@@ -134,9 +140,12 @@
 ; CHECK-NEXT:    cmpne p4.d, p0/z, z1.d, #0
 ; CHECK-NEXT:    cmpne p0.d, p0/z, z0.d, #0
 ; CHECK-NEXT:    uzp1 p0.s, p0.s, p4.s
+; CHECK-NEXT:    ldr p4, [sp, #7, mul vl] // 2-byte Folded Reload
 ; CHECK-NEXT:    uzp1 p1.h, p3.h, p1.h
 ; CHECK-NEXT:    uzp1 p0.h, p0.h, p2.h
 ; CHECK-NEXT:    uzp1 p0.b, p0.b, p1.b
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    ldr x29, [sp], #16 // 8-byte Folded Reload
 ; CHECK-NEXT:    ret
 entry:
   %out = trunc <vscale x 16 x i64> %in to <vscale x 16 x i1>
Index: llvm/test/CodeGen/AArch64/sve-calling-convention.ll
===================================================================
--- llvm/test/CodeGen/AArch64/sve-calling-convention.ll
+++ llvm/test/CodeGen/AArch64/sve-calling-convention.ll
@@ -1,4 +1,5 @@
 ; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -stop-after=finalize-isel < %s 2>%t | FileCheck %s
+; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -stop-after=prologepilog < %s 2>%t | FileCheck %s --check-prefix=CHECKCSR
 ; RUN: FileCheck --check-prefix=WARN --allow-empty %s <%t
 
 ; If this check fails please read test/CodeGen/AArch64/README for instructions on how to resolve it.
@@ -123,3 +124,25 @@
   %res = call <vscale x 4 x i1> @sve_signature_pred(<vscale x 4 x i1> %arg2, <vscale x 4 x i1> %arg1)
   ret <vscale x 4 x i1> %res
 }
+
+; Test that functions returning or taking SVE arguments use the correct
+; callee-saved set when using the default C calling convention (as opposed
+; to aarch64_sve_vector_pcs)
+
+; CHECKCSR-LABEL: name: sve_signature_vec_ret_callee
+; CHECKCSR: callee-saved-register: '$z8'
+; CHECKCSR: callee-saved-register: '$p4'
+; CHECKCSR: RET_ReallyLR
+define <vscale x 4 x i32> @sve_signature_vec_ret_callee() nounwind {
+  call void asm sideeffect "nop", "~{z8},~{p4}"()
+  ret <vscale x 4 x i32> zeroinitializer
+}
+
+; CHECKCSR-LABEL: name: sve_signature_vec_arg_callee
+; CHECKCSR: callee-saved-register: '$z8'
+; CHECKCSR: callee-saved-register: '$p4'
+; CHECKCSR: RET_ReallyLR
+define void @sve_signature_vec_arg_callee(<vscale x 4 x i32> %v) nounwind {
+  call void asm sideeffect "nop", "~{z8},~{p4}"()
+  ret void
+}
Index: llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
===================================================================
--- llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
+++ llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
@@ -40,6 +40,14 @@
   AArch64_MC::initLLVMToCVRegMapping(this);
 }
 
+static bool hasSVEArgsOrReturn(const MachineFunction *MF) {
+  const Function &F = MF->getFunction();
+  return isa<ScalableVectorType>(F.getReturnType()) ||
+         any_of(F.args(), [](const Argument &Arg) {
+           return isa<ScalableVectorType>(Arg.getType());
+         });
+}
+
 const MCPhysReg *
 AArch64RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
   assert(MF && "Invalid MachineFunction pointer.");
@@ -75,6 +83,8 @@
     // This is for OSes other than Windows; Windows is a separate case further
     // above.
     return CSR_AArch64_AAPCS_X18_SaveList;
+  if (hasSVEArgsOrReturn(MF))
+    return CSR_AArch64_SVE_AAPCS_SaveList;
   return CSR_AArch64_AAPCS_SaveList;
 }
 


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