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[GlobalISel] Mark memcpy/memmove/memset as thisreturn

Browse Source 
https://clang.godbolt.org/z/9az64j8W6

rdar://77466123

Differential revision: https://reviews.llvm.org/D105370
This commit is contained in:
Jon Roelofs 2021-07-02 13:08:57 -07:00
parent 53129328a6
commit 98d4971f24
3 changed files with 10 additions and 8 deletions
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6
lib/CodeGen/GlobalISel/LegalizerHelper.cpp
View File

@ -580,15 +580,18 @@ llvm::createMemLibcall(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI,
break;
case TargetOpcode::G_MEMCPY:
RTLibcall = RTLIB::MEMCPY;
Args[0].Flags[0].setReturned();
break;
case TargetOpcode::G_MEMMOVE:
RTLibcall = RTLIB::MEMMOVE;
Args[0].Flags[0].setReturned();
break;
case TargetOpcode::G_MEMSET:
RTLibcall = RTLIB::MEMSET;
Args[0].Flags[0].setReturned();
break;
default:
return LegalizerHelper::UnableToLegalize;
llvm_unreachable("unsupported opcode");
}
const char *Name = TLI.getLibcallName(RTLibcall);
@ -610,7 +613,6 @@ llvm::createMemLibcall(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI,
if (!CLI.lowerCall(MIRBuilder, Info))
return LegalizerHelper::UnableToLegalize;
if (Info.LoweredTailCall) {
assert(Info.IsTailCall && "Lowered tail call when it wasn't a tail call?");

10
test/CodeGen/AArch64/GlobalISel/legalize-memcpy-et-al.mir
View File

@ -18,7 +18,7 @@ body: |
; CHECK: $x0 = COPY [[COPY]](p0)
; CHECK: $x1 = COPY [[COPY1]](p0)
; CHECK: $x2 = COPY [[ZEXT]](s64)
; CHECK: BL &memcpy, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: BL &memcpy, csr_aarch64_aapcs_thisreturn, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sp, implicit $sp
; CHECK: RET_ReallyLR
%0:_(p0) = COPY $x0
@ -71,7 +71,7 @@ body: |
; CHECK: $x0 = COPY [[COPY]](p0)
; CHECK: $x1 = COPY [[COPY1]](p0)
; CHECK: $x2 = COPY [[ZEXT]](s64)
; CHECK: BL &memmove, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: BL &memmove, csr_aarch64_aapcs_thisreturn, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sp, implicit $sp
; CHECK: RET_ReallyLR
%0:_(p0) = COPY $x0
@ -100,7 +100,7 @@ body: |
; CHECK: [[COPY3:%[0-9]+]]:_(s32) = COPY [[COPY1]](s32)
; CHECK: $w1 = COPY [[COPY3]](s32)
; CHECK: $x2 = COPY [[ZEXT]](s64)
; CHECK: BL &memset, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit $x0, implicit $w1, implicit $x2
; CHECK: BL &memset, csr_aarch64_aapcs_thisreturn, implicit-def $lr, implicit $sp, implicit $x0, implicit $w1, implicit $x2
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sp, implicit $sp
; CHECK: RET_ReallyLR
%0:_(p0) = COPY $x0
@ -129,7 +129,7 @@ body: |
; CHECK: $x0 = COPY [[COPY]](p0)
; CHECK: $x1 = COPY [[COPY1]](p0)
; CHECK: $x2 = COPY [[ZEXT]](s64)
; CHECK: BL &memcpy, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: BL &memcpy, csr_aarch64_aapcs_thisreturn, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sp, implicit $sp
; CHECK: $x0 = COPY [[ZEXT]](s64)
; CHECK: RET_ReallyLR implicit $x0
@ -158,7 +158,7 @@ body: |
; CHECK: $x0 = COPY [[COPY]](p0)
; CHECK: $x1 = COPY [[COPY1]](p0)
; CHECK: $x2 = COPY [[ZEXT]](s64)
; CHECK: BL &memcpy, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: BL &memcpy, csr_aarch64_aapcs_thisreturn, implicit-def $lr, implicit $sp, implicit $x0, implicit $x1, implicit $x2
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sp, implicit $sp
; CHECK: TCRETURNdi &memset, 0, csr_aarch64_aapcs, implicit $sp
%0:_(p0) = COPY $x0

2
test/CodeGen/AArch64/GlobalISel/legalize-memlib-debug-loc.mir
View File

@ -47,7 +47,7 @@ body: |
; We're checking that the BL call has the debug loc of the original intrinsic call.
; CHECK-LABEL: name: test_memset_debug
; CHECK: BL &memset, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit $x0, implicit $w1, implicit $x2, debug-location !11
; CHECK: BL &memset, csr_aarch64_aapcs_thisreturn, implicit-def $lr, implicit $sp, implicit $x0, implicit $w1, implicit $x2, debug-location !11
; CHECK: RET_ReallyLR debug-location !12
%0:_(p0) = COPY $x0
%1:_(s32) = COPY $w1