https://bugs.llvm.org/show_bug.cgi?id=41952
Bug ID: 41952
Summary: [x86] shiftAmountMod should be more eager?
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]
unsigned test(unsigned val, unsigned a, unsigned b) {
unsigned shift = (32 - a) - b;
return val << shift;
}
clang produces
mov eax, 32
sub eax, esi
sub eax, edx
shlx eax, edi, eax
icc produces
neg esi # <- yay
sub esi, edx
mov ecx, esi
shl edi, cl
https://godbolt.org/z/gdGx_u
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