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* [Bug rtl-optimization/100087] New: Redundant extend with compare against zero for baseline Armv8-M
@ 2021-04-14 21:22 acoplan at gcc dot gnu.org
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From: acoplan at gcc dot gnu.org @ 2021-04-14 21:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100087
Bug ID: 100087
Summary: Redundant extend with compare against zero for
baseline Armv8-M
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: acoplan at gcc dot gnu.org
Target Milestone: ---
For the following:
_Bool eq0(int x)
{
return x == 0;
}
with -march=armv8-m.base -O2 we generate:
eq0:
rsbs r3, r0, #0
adcs r0, r0, r3
uxtb r0, r0
bx lr
but the uxtb is redundant.
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2021-04-14 21:22 [Bug rtl-optimization/100087] New: Redundant extend with compare against zero for baseline Armv8-M acoplan at gcc dot gnu.org
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