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Refine Word32Pair* shift code generation.

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R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1797383002

Cr-Commit-Position: refs/heads/master@{#34796}
This commit is contained in:
mbrandy 2016-03-15 12:28:40 -07:00 committed by Commit bot
parent 3b5e84ab0e
commit c423e9851f
1 changed files with 12 additions and 3 deletions
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15
src/ppc/macro-assembler-ppc.cc
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@ -860,7 +860,10 @@ void MacroAssembler::ShiftLeftPair(Register dst_low, Register dst_high,
uint32_t shift) {
DCHECK(!AreAliased(dst_low, src_high));
DCHECK(!AreAliased(dst_high, src_low));
if (shift >= 32) {
if (shift == 32) {
Move(dst_high, src_low);
li(dst_low, Operand::Zero());
} else if (shift > 32) {
shift &= 0x1f;
slwi(dst_high, src_low, Operand(shift));
li(dst_low, Operand::Zero());
@ -903,7 +906,10 @@ void MacroAssembler::ShiftRightPair(Register dst_low, Register dst_high,
uint32_t shift) {
DCHECK(!AreAliased(dst_low, src_high));
DCHECK(!AreAliased(dst_high, src_low));
if (shift >= 32) {
if (shift == 32) {
Move(dst_low, src_high);
li(dst_high, Operand::Zero());
} else if (shift > 32) {
shift &= 0x1f;
srwi(dst_low, src_high, Operand(shift));
li(dst_high, Operand::Zero());
@ -946,7 +952,10 @@ void MacroAssembler::ShiftRightAlgPair(Register dst_low, Register dst_high,
uint32_t shift) {
DCHECK(!AreAliased(dst_low, src_high));
DCHECK(!AreAliased(dst_high, src_low));
if (shift >= 32) {
if (shift == 32) {
Move(dst_low, src_high);
srawi(dst_high, src_high, 31);
} else if (shift > 32) {
shift &= 0x1f;
srawi(dst_low, src_high, shift);
srawi(dst_high, src_high, 31);