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[liftoff][arm] Implement type conversion

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This implements type conversion for the arm32 port of Liftoff.

Bug: v8:6600
Change-Id: Id100df92dc5e9f9df1b7b26158e35bb36b742f10
Reviewed-on: https://chromium-review.googlesource.com/c/1348409
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57778}
This commit is contained in:
George Wort 2018-11-22 16:20:34 +00:00 committed by Commit Bot
parent 9aa861c4bc
commit 7aad32cda1
1 changed files with 103 additions and 2 deletions
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103
src/wasm/baseline/arm/liftoff-assembler-arm.h
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@ -716,8 +716,109 @@ void LiftoffAssembler::emit_i32_to_intptr(Register dst, Register src) {
bool LiftoffAssembler::emit_type_conversion(WasmOpcode opcode,
LiftoffRegister dst,
LiftoffRegister src, Label* trap) {
BAILOUT("emit_type_conversion");
switch (opcode) {
case kExprI32ConvertI64:
TurboAssembler::Move(dst.gp(), src.low_gp());
return true;
case kExprI32SConvertF32: {
BAILOUT("kExprI32SConvertF32");
return true;
}
case kExprI32UConvertF32: {
BAILOUT("kExprI32UConvertF32");
return true;
}
case kExprI32SConvertF64: {
UseScratchRegisterScope temps(this);
SwVfpRegister scratch_f = temps.AcquireS();
vcvt_s32_f64(scratch_f, src.fp()); // f64 -> i32 round to zero.
vmov(dst.gp(), scratch_f);
// Check underflow and NaN.
DwVfpRegister scratch_d = temps.AcquireD();
vmov(scratch_d, Double(static_cast<double>(INT32_MIN - 1.0)));
VFPCompareAndSetFlags(src.fp(), scratch_d);
b(trap, le);
// Check overflow.
vmov(scratch_d, Double(static_cast<double>(INT32_MAX + 1.0)));
VFPCompareAndSetFlags(src.fp(), scratch_d);
b(trap, ge);
return true;
}
case kExprI32UConvertF64: {
UseScratchRegisterScope temps(this);
SwVfpRegister scratch_f = temps.AcquireS();
vcvt_u32_f64(scratch_f, src.fp()); // f64 -> i32 round to zero.
vmov(dst.gp(), scratch_f);
// Check underflow and NaN.
DwVfpRegister scratch_d = temps.AcquireD();
vmov(scratch_d, Double(static_cast<double>(-1.0)));
VFPCompareAndSetFlags(src.fp(), scratch_d);
b(trap, le);
// Check overflow.
vmov(scratch_d, Double(static_cast<double>(UINT32_MAX + 1.0)));
VFPCompareAndSetFlags(src.fp(), scratch_d);
b(trap, ge);
return true;
}
case kExprI32ReinterpretF32:
BAILOUT("kExprI32ReinterpretF32");
return true;
case kExprI64SConvertI32:
if (dst.low_gp() != src.gp()) mov(dst.low_gp(), src.gp());
mov(dst.high_gp(), Operand(src.gp(), ASR, 31));
return true;
case kExprI64UConvertI32:
if (dst.low_gp() != src.gp()) mov(dst.low_gp(), src.gp());
mov(dst.high_gp(), Operand(0));
return true;
case kExprI64ReinterpretF64:
vmov(dst.low_gp(), dst.high_gp(), src.fp());
return true;
case kExprF32SConvertI32:
BAILOUT("kExprF32SConvertI32");
return true;
case kExprF32UConvertI32:
BAILOUT("kExprF32UConvertI32");
return true;
case kExprF32ConvertF64:
BAILOUT("kExprF32ConvertF64");
return true;
case kExprF32ReinterpretI32:
BAILOUT("kExprF32ReinterpretI32");
return true;
case kExprF64SConvertI32: {
UseScratchRegisterScope temps(this);
SwVfpRegister scratch = temps.AcquireS();
vmov(scratch, src.gp());
vcvt_f64_s32(dst.fp(), scratch);
return true;
}
case kExprF64UConvertI32: {
UseScratchRegisterScope temps(this);
SwVfpRegister scratch = temps.AcquireS();
vmov(scratch, src.gp());
vcvt_f64_u32(dst.fp(), scratch);
return true;
}
case kExprF64ConvertF32:
BAILOUT("kExprF64ConvertF32");
return true;
case kExprF64ReinterpretI64:
vmov(dst.fp(), src.low_gp(), src.high_gp());
return true;
case kExprF64SConvertI64:
case kExprF64UConvertI64:
case kExprI64SConvertF32:
case kExprI64UConvertF32:
case kExprF32SConvertI64:
case kExprF32UConvertI64:
case kExprI64SConvertF64:
case kExprI64UConvertF64:
// These cases can be handled by the C fallback function.
return false;
default:
UNREACHABLE();
}
}
void LiftoffAssembler::emit_i32_signextend_i8(Register dst, Register src) {