https://llvm.org/bugs/show_bug.cgi?id=28567
Bug ID: 28567
Summary: [IPRA] Reg Usage Info Collector too aggressive.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Register Allocator
Assignee: unassignedb...@nondot.org
Reporter: zyfw...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
==== arm.c ====
char add(char b)
{
return b + 1;
}
==== arm.ll =====
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv4t--"
; Function Attrs: minsize norecurse nounwind optsize readnone
define arm_aapcscc zeroext i8 @add(i8 zeroext %b) {
entry:
%conv = zext i8 %b to i32
%add = add nuw nsw i32 %conv, 1
%conv1 = trunc i32 %add to i8
ret i8 %conv1
}
==== arm.s =====
add: @ @add
.fnstart
@ BB#0: @ %entry
add r0, r0, #1
and r0, r0, #255
bx lr
$ llc -march=arm arm.ll -enable-ipra=true -print-regusage
add Clobbered Registers: R0 R1 R0_R1
I think it should be:
$ llc -march=arm arm.ll -enable-ipra=true -print-regusage
add Clobbered Registers: R0 R0_R1
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