https://bugs.llvm.org/show_bug.cgi?id=49925
Bug ID: 49925
Summary: [X86] Faliure to produce LEA from add(trunc(add(x,
y)), C)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
int good(int x, int y) {
return (x + y) - 31;
}
char bad(int x, int y) {
return x + y - 31;
}
https://godbolt.org/z/adncTno96
good(int, int): # @good(int, int)
leal -31(%rdi,%rsi), %eax
retq
bad(int, int): # @bad(int, int)
leal (%rdi,%rsi), %eax
addb $-31, %al
retq
https://alive2.llvm.org/ce/z/UFxwYE
It seems we don't even try to run LEA peephole on that outer i8 add.
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