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[RegAlloc] Check that subreg liveness tracking applies to given virtual reg

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Subregister liveness applies selectively to register classes with certain
properties. Make sure that when it's enabled, it applies to a given virtual
register (in virtual register rewriter).

llvm-svn: 339784
This commit is contained in:
Krzysztof Parzyszek 2018-08-15 16:07:47 +00:00
parent 3542a5ebf4
commit f8e085075d
2 changed files with 23 additions and 1 deletions
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2
lib/CodeGen/VirtRegMap.cpp
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@ -525,7 +525,7 @@ void VirtRegRewriter::rewrite() {
// Preserve semantics of sub-register operands.
unsigned SubReg = MO.getSubReg();
if (SubReg != 0) {
if (NoSubRegLiveness) {
if (NoSubRegLiveness || !MRI->shouldTrackSubRegLiveness(VirtReg)) {
// A virtual register kill refers to the whole register, so we may
// have to add implicit killed operands for the super-register. A
// partial redef always kills and redefines the super-register.

22
test/CodeGen/SystemZ/subregliveness-02.ll Normal file
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@ -0,0 +1,22 @@
; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -systemz-subreg-liveness < %s | FileCheck %s
; Check for successful compilation.
; CHECK: meeb %f0, 0(%r1)
target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"
target triple = "s390x-ibm-linux"
; Function Attrs: nounwind
define void @spec_random_load() #0 {
bb:
%tmp = sitofp i64 undef to float
%tmp1 = fmul float %tmp, 0x3E00000000000000
%tmp2 = fpext float %tmp1 to double
%tmp3 = fmul double %tmp2, 2.560000e+02
%tmp4 = fptosi double %tmp3 to i32
%tmp5 = trunc i32 %tmp4 to i8
store i8 %tmp5, i8* undef, align 1
unreachable
}
attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="z13" "target-features"="+transactional-execution,+vector" "unsafe-fp-math"="false" "use-soft-float"="false" }