https://bugs.llvm.org/show_bug.cgi?id=44234
Bug ID: 44234
Summary: Missed negation pattern
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: llvm-bugs@lists.llvm.org
int f1 (int t, int v, int x)
{
int a = t - x;
int b = a * v;
return 0 - b;
}
int f2 (int t, int v, int x)
{
int a = v - t;
int b = a * x;
return 0 - b;
}
GCC:
f1(int, int, int):
sub edx, edi
mov eax, edx
imul eax, esi
ret
f2(int, int, int):
sub edi, esi
mov eax, edi
imul eax, edx
ret
LLVM:
f1(int, int, int):
mov eax, edi
sub eax, edx
imul eax, esi
neg eax
ret
f2(int, int, int):
mov eax, esi
sub eax, edi
imul eax, edx
neg eax
ret
https://godbolt.org/z/afTGuz
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