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s390x: Add CountTrailingZerosU32/U64 to TFAssem

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Change-Id: Idf653061a88beb348fa13e907932ca68f2d6d05b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2685366
Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72636}
This commit is contained in:
Junliang Yan 2021-02-10 13:05:32 -05:00 committed by Commit Bot
parent 518ee01d39
commit 2c055469d8
2 changed files with 51 additions and 3 deletions
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41
src/codegen/s390/macro-assembler-s390.cc
View File

@ -4712,6 +4712,47 @@ void TurboAssembler::CountLeadingZerosU64(Register dst, Register src,
mov(dst, scratch_pair);
}
void TurboAssembler::CountTrailingZerosU32(Register dst, Register src,
Register scratch_pair) {
Register scratch0 = scratch_pair;
Register scratch1 = Register::from_code(scratch_pair.code() + 1);
DCHECK(!AreAliased(dst, scratch0, scratch1));
DCHECK(!AreAliased(src, scratch0, scratch1));
Label done;
// Check if src is all zeros.
ltr(scratch1, src);
mov(dst, Operand(32));
beq(&done);
llgfr(scratch1, scratch1);
lcgr(scratch0, scratch1);
ngr(scratch1, scratch0);
flogr(scratch0, scratch1);
mov(dst, Operand(63));
SubS64(dst, scratch0);
bind(&done);
}
void TurboAssembler::CountTrailingZerosU64(Register dst, Register src,
Register scratch_pair) {
Register scratch0 = scratch_pair;
Register scratch1 = Register::from_code(scratch_pair.code() + 1);
DCHECK(!AreAliased(dst, scratch0, scratch1));
DCHECK(!AreAliased(src, scratch0, scratch1));
Label done;
// Check if src is all zeros.
ltgr(scratch1, src);
mov(dst, Operand(64));
beq(&done);
lcgr(scratch0, scratch1);
ngr(scratch0, scratch1);
flogr(scratch0, scratch0);
mov(dst, Operand(63));
SubS64(dst, scratch0);
bind(&done);
}
} // namespace internal
} // namespace v8

13
src/codegen/s390/macro-assembler-s390.h
View File

@ -495,9 +495,6 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
void Popcnt64(Register dst, Register src);
#endif
// CountLeadingZeros will corrupt the scratch register pair (eg. r0:r1)
void CountLeadingZerosU32(Register dst, Register src, Register scratch_pair);
void CountLeadingZerosU64(Register dst, Register src, Register scratch_pair);
void mov(Register dst, const Operand& src);
void mov(Register dst, Register src);
@ -1030,6 +1027,16 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
void DecompressAnyTagged(Register destination, MemOperand field_operand);
void DecompressAnyTagged(Register destination, Register source);
// CountLeadingZeros will corrupt the scratch register pair (eg. r0:r1)
void CountLeadingZerosU32(Register dst, Register src,
Register scratch_pair = r0);
void CountLeadingZerosU64(Register dst, Register src,
Register scratch_pair = r0);
void CountTrailingZerosU32(Register dst, Register src,
Register scratch_pair = r0);
void CountTrailingZerosU64(Register dst, Register src,
Register scratch_pair = r0);
private:
static const int kSmiShift = kSmiTagSize + kSmiShiftSize;