Reviewers: mtbrandyberry, michael_dawson,
Description:
PPC: smi test optimization
[email protected], [email protected]
BUG=
Please review this at https://codereview.chromium.org/1177263002/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+7, -2 lines):
M src/ppc/macro-assembler-ppc.h
Index: src/ppc/macro-assembler-ppc.h
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index
491167b227d531009629d7fb4a7d44ad3b6a238c..019ca2217cb072d86137dfd5c690fd80502022c2
100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -1063,11 +1063,16 @@ class MacroAssembler : public Assembler {
DCHECK(rangeStart >= rangeEnd && rangeStart < kBitsPerPointer);
int rotate = (rangeEnd == 0) ? 0 : kBitsPerPointer - rangeEnd;
int width = rangeStart - rangeEnd + 1;
+ if (rc == SetRC && rangeEnd == 0 && width <= 16) {
+ andi(dst, src, Operand((1 << width) - 1));
+ } else {
#if V8_TARGET_ARCH_PPC64
- rldicl(dst, src, rotate, kBitsPerPointer - width, rc);
+ rldicl(dst, src, rotate, kBitsPerPointer - width, rc);
#else
- rlwinm(dst, src, rotate, kBitsPerPointer - width, kBitsPerPointer - 1,
rc);
+ rlwinm(dst, src, rotate, kBitsPerPointer - width, kBitsPerPointer -
1,
+ rc);
#endif
+ }
}
inline void ExtractBit(Register dst, Register src, uint32_t bitNumber,
--
--
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