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[MIPS GlobalISel] Lower SRet pointer arguments

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Instead of returning structure by value clang usually adds pointer
to that structure as an argument. Pointers don't require special
handling no matter the SRet flag. Remove unsuccessful exit from
lowerCall for arguments with SRet flag if they are pointers.

Differential Revision: https://reviews.llvm.org/D67179

llvm-svn: 371054
This commit is contained in:
Petar Avramovic 2019-09-05 11:12:01 +00:00
parent 938d63b173
commit 97f33cfcbf
3 changed files with 80 additions and 1 deletions
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4
lib/Target/Mips/MipsCallLowering.cpp
View File

@ -508,7 +508,9 @@ bool MipsCallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
for (auto &Arg : Info.OrigArgs) {
if (!isSupportedType(Arg.Ty))
return false;
if (Arg.Flags[0].isByVal() || Arg.Flags[0].isSRet())
if (Arg.Flags[0].isByVal())
return false;
if (Arg.Flags[0].isSRet() && !Arg.Ty->isPointerTy())
return false;
}

39
test/CodeGen/Mips/GlobalISel/irtranslator/sret_pointer.ll Normal file
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@ -0,0 +1,39 @@
; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
; RUN: llc -O0 -mtriple=mipsel-linux-gnu -global-isel -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
%struct.S = type { i32, i32 }
define void @ZeroInit(%struct.S* noalias sret %agg.result) {
; MIPS32-LABEL: name: ZeroInit
; MIPS32: bb.1.entry:
; MIPS32: liveins: $a0
; MIPS32: [[COPY:%[0-9]+]]:_(p0) = COPY $a0
; MIPS32: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
; MIPS32: [[COPY1:%[0-9]+]]:_(p0) = COPY [[COPY]](p0)
; MIPS32: G_STORE [[C]](s32), [[COPY1]](p0) :: (store 4 into %ir.x)
; MIPS32: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 4
; MIPS32: [[GEP:%[0-9]+]]:_(p0) = G_GEP [[COPY]], [[C1]](s32)
; MIPS32: G_STORE [[C]](s32), [[GEP]](p0) :: (store 4 into %ir.y)
; MIPS32: RetRA
entry:
%x = getelementptr inbounds %struct.S, %struct.S* %agg.result, i32 0, i32 0
store i32 0, i32* %x, align 4
%y = getelementptr inbounds %struct.S, %struct.S* %agg.result, i32 0, i32 1
store i32 0, i32* %y, align 4
ret void
}
define void @CallZeroInit(%struct.S* noalias sret %agg.result) {
; MIPS32-LABEL: name: CallZeroInit
; MIPS32: bb.1.entry:
; MIPS32: liveins: $a0
; MIPS32: [[COPY:%[0-9]+]]:_(p0) = COPY $a0
; MIPS32: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
; MIPS32: $a0 = COPY [[COPY]](p0)
; MIPS32: JAL @ZeroInit, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0
; MIPS32: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
; MIPS32: RetRA
entry:
call void @ZeroInit(%struct.S* sret %agg.result)
ret void
}

38
test/CodeGen/Mips/GlobalISel/llvm-ir/sret_pointer.ll Normal file
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@ -0,0 +1,38 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -O0 -mtriple=mipsel-linux-gnu -global-isel -verify-machineinstrs %s -o -| FileCheck %s -check-prefixes=MIPS32
%struct.S = type { i32, i32 }
define void @ZeroInit(%struct.S* noalias sret %agg.result) {
; MIPS32-LABEL: ZeroInit:
; MIPS32: # %bb.0: # %entry
; MIPS32-NEXT: ori $1, $zero, 0
; MIPS32-NEXT: sw $1, 0($4)
; MIPS32-NEXT: sw $1, 4($4)
; MIPS32-NEXT: jr $ra
; MIPS32-NEXT: nop
entry:
%x = getelementptr inbounds %struct.S, %struct.S* %agg.result, i32 0, i32 0
store i32 0, i32* %x, align 4
%y = getelementptr inbounds %struct.S, %struct.S* %agg.result, i32 0, i32 1
store i32 0, i32* %y, align 4
ret void
}
define void @CallZeroInit(%struct.S* noalias sret %agg.result) {
; MIPS32-LABEL: CallZeroInit:
; MIPS32: # %bb.0: # %entry
; MIPS32-NEXT: addiu $sp, $sp, -24
; MIPS32-NEXT: .cfi_def_cfa_offset 24
; MIPS32-NEXT: sw $ra, 20($sp) # 4-byte Folded Spill
; MIPS32-NEXT: .cfi_offset 31, -4
; MIPS32-NEXT: jal ZeroInit
; MIPS32-NEXT: nop
; MIPS32-NEXT: lw $ra, 20($sp) # 4-byte Folded Reload
; MIPS32-NEXT: addiu $sp, $sp, 24
; MIPS32-NEXT: jr $ra
; MIPS32-NEXT: nop
entry:
call void @ZeroInit(%struct.S* sret %agg.result)
ret void
}