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s390: Optimize LoadDoubleLiteral

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R=joransiu@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2611773003
Cr-Commit-Position: refs/heads/master@{#42050}
This commit is contained in:
jyan 2017-01-03 13:14:15 -08:00 committed by Commit bot
parent e87e82b8e7
commit 410606a09d
1 changed files with 13 additions and 10 deletions
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23
src/s390/macro-assembler-s390.cc
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@ -4334,9 +4334,16 @@ void MacroAssembler::LoadDoubleLiteral(DoubleRegister result, uint64_t value,
uint32_t lo_32 = static_cast<uint32_t>(value);
// Load the 64-bit value into a GPR, then transfer it to FPR via LDGR
iihf(scratch, Operand(hi_32));
iilf(scratch, Operand(lo_32));
ldgr(result, scratch);
if (value == 0) {
lzdr(result);
} else if (lo_32 == 0) {
llihf(scratch, Operand(hi_32));
ldgr(result, scratch);
} else {
iihf(scratch, Operand(hi_32));
iilf(scratch, Operand(lo_32));
ldgr(result, scratch);
}
}
void MacroAssembler::LoadDoubleLiteral(DoubleRegister result, double value,
@ -4347,13 +4354,9 @@ void MacroAssembler::LoadDoubleLiteral(DoubleRegister result, double value,
void MacroAssembler::LoadFloat32Literal(DoubleRegister result, float value,
Register scratch) {
uint32_t hi_32 = bit_cast<uint32_t>(value);
uint32_t lo_32 = 0;
// Load the 64-bit value into a GPR, then transfer it to FPR via LDGR
iihf(scratch, Operand(hi_32));
iilf(scratch, Operand(lo_32));
ldgr(result, scratch);
uint64_t int_val = static_cast<uint64_t>(bit_cast<uint32_t, float>(value))
<< 32;
LoadDoubleLiteral(result, int_val, scratch);
}
void MacroAssembler::CmpSmiLiteral(Register src1, Smi* smi, Register scratch) {