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[SystemZ] Bugfix for MVCLoop CC clobbering. 

MVCLoop clobbers CC (since it emits a compare/branch), but this was not
modelled.

Review: Ulrich Weigand
llvm-svn: 331627
This commit is contained in:
Jonas Paulsson 2018-05-07 10:48:43 +00:00
parent 61de8a5aef
commit ebb1605bf3
2 changed files with 35 additions and 1 deletions
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2
llvm/lib/Target/SystemZ/SystemZInstrFormats.td
View File

@ -4779,7 +4779,7 @@ class AtomicLoadWBinaryImm<SDPatternOperator operator, Immediate imm>
multiclass MemorySS<string mnemonic, bits<8> opcode,
SDPatternOperator sequence, SDPatternOperator loop> {
def "" : SideEffectBinarySSa<mnemonic, opcode>;
let usesCustomInserter = 1, hasNoSchedulingInfo = 1 in {
let usesCustomInserter = 1, hasNoSchedulingInfo = 1, Defs = [CC] in {
def Sequence : Pseudo<(outs), (ins bdaddr12only:$dest, bdaddr12only:$src,
imm64:$length),
[(sequence bdaddr12only:$dest, bdaddr12only:$src,

34
llvm/test/CodeGen/SystemZ/cc-liveness.ll Normal file
View File

@ -0,0 +1,34 @@
; Check that the MVCLoop (memcpy) is marked as clobbering CC, so that it will
; not be placed betwen two compare and load-on-condition instructions.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 -pre-RA-sched=list-ilp \
; RUN: -print-after=expand-isel-pseudos 2>&1 | FileCheck %s
;
; CHECK-LABEL: bb.0.bb:
; CHECK: CLI
; CHECK: LOCGHI
; CHECK-LABEL: bb.2.bb:
; CHECK: MVC
@.str.35 = external dso_local unnamed_addr constant [9 x i8], align 2
@func_38.l_1854 = external dso_local unnamed_addr constant [7 x [10 x [3 x i64**]]], align 8
; Function Attrs: nounwind
define dso_local signext i32 @main(i32 signext %arg, i8** nocapture readonly %arg1) local_unnamed_addr #0 {
bb:
%tmp = load i8, i8* undef, align 1
%tmp2 = zext i8 %tmp to i32
%tmp3 = sub nsw i32 0, %tmp2
%tmp4 = icmp eq i32 %tmp3, 0
%tmp5 = zext i1 %tmp4 to i32
call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 8 undef, i8* align 8 bitcast ([7 x [10 x [3 x i64**]]]* @func_38.l_1854 to i8*), i64 1680, i1 false) #2
call fastcc void @transparent_crc(i64 undef, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.35, i64 0, i64 0), i32 signext %tmp5)
unreachable
}
; Function Attrs: nounwind
declare dso_local fastcc void @transparent_crc(i64, i8*, i32 signext) unnamed_addr #0
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #1