https://llvm.org/bugs/show_bug.cgi?id=27203
Bug ID: 27203
Summary: [ppc] hoist repeated constant for better code size and
speed
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Filing a sentimental PPC sibling report for bug 27202:
define i1 @foo(i32 %i) {
%and = and i32 %i, 305419896
%cmp = icmp eq i32 %and, 305419896
ret i1 %cmp
}
$ ./llc maskcmp.ll -mtriple=powerpc64 -o -
...
lis 4, 4660
ori 4, 4, 22136
and 3, 3, 4
xoris 3, 3, 4660 <--- why bother?
cmplwi 3, 22136 <--- use cmplw instead
li 3, 1
bclr 12, 2, 0
# BB#1:
li 3, 0
blr
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