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FIx floating point trunc's.

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This commit is contained in:
losfair 2019-03-17 19:54:20 +08:00
parent d8d39c309c
commit 7394df2fd8
1 changed files with 61 additions and 24 deletions
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85
lib/dynasm-backend/src/codegen_x64.rs
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@ -3746,19 +3746,17 @@ impl FunctionCodeGenerator for X64FunctionCode {
assembler
; test Rq(reg as u8), Rq(reg as u8)
; js >do_convert
// fast path: positive as signed
; cvtsi2ss xmm1, Rq(reg as u8)
; movd Rd(reg as u8), xmm1
; jmp >end_convert
; do_convert:
// use r15 as temporary register
; movq xmm5, r15
; mov r15, Rq(reg as u8)
; and r15, 1
; shr Rq(reg as u8), 1
; or Rq(reg as u8), r15
; cvtsi2ss xmm1, Rq(reg as u8)
; addsd xmm1, xmm1
; addss xmm1, xmm1
; movq r15, xmm5
; movd Rd(reg as u8), xmm1
; end_convert:
@ -3823,12 +3821,10 @@ impl FunctionCodeGenerator for X64FunctionCode {
assembler
; test Rq(reg as u8), Rq(reg as u8)
; js >do_convert
// fast path: positive as signed
; cvtsi2sd xmm1, Rq(reg as u8)
; movq Rq(reg as u8), xmm1
; jmp >end_convert
; do_convert:
// use r15 as temporary register
; movq xmm5, r15
; mov r15, Rq(reg as u8)
; and r15, 1
@ -4232,8 +4228,8 @@ impl FunctionCodeGenerator for X64FunctionCode {
dynasm!(
assembler
; movd xmm1, Rd(reg as u8)
; roundss xmm1, xmm1, 3
; cvtss2si Rd(reg as u8), xmm1
; cvttss2si Rq(reg as u8), xmm1
; mov Rd(reg as u8), Rd(reg as u8)
);
},
WpType::F32,
@ -4254,8 +4250,7 @@ impl FunctionCodeGenerator for X64FunctionCode {
dynasm!(
assembler
; movd xmm1, Rd(reg as u8)
; roundss xmm1, xmm1, 3
; cvtss2si Rd(reg as u8), xmm1
; cvttss2si Rd(reg as u8), xmm1
);
},
WpType::F32,
@ -4273,11 +4268,33 @@ impl FunctionCodeGenerator for X64FunctionCode {
-1.0,
18446744073709551616.0,
);
/*
LCPI0_0:
.long 1593835520 ## float 9.22337203E+18
movss LCPI0_0(%rip), %xmm1 ## xmm1 = mem[0],zero,zero,zero
movaps %xmm0, %xmm2
subss %xmm1, %xmm2
cvttss2si %xmm2, %rax
movabsq $-9223372036854775808, %rcx ## imm = 0x8000000000000000
xorq %rax, %rcx
cvttss2si %xmm0, %rax
ucomiss %xmm1, %xmm0
cmovaeq %rcx, %rax
*/
dynasm!(
assembler
; movd xmm1, Rd(reg as u8)
; roundss xmm1, xmm1, 3
; cvtss2si Rq(reg as u8), xmm1
; mov r13d, 1593835520u32 as i32 //float 9.22337203E+18
; movd xmm1, r13d
; movd xmm2, Rd(reg as u8)
; movd xmm3, Rd(reg as u8)
; subss xmm2, xmm1
; cvttss2si Rq(reg as u8), xmm2
; mov r13, QWORD 0x8000000000000000u64 as i64
; xor r13, Rq(reg as u8)
; cvttss2si Rq(reg as u8), xmm3
; ucomiss xmm3, xmm1
; cmovae Rq(reg as u8), r13
);
},
WpType::F32,
@ -4298,8 +4315,7 @@ impl FunctionCodeGenerator for X64FunctionCode {
dynasm!(
assembler
; movd xmm1, Rd(reg as u8)
; roundss xmm1, xmm1, 3
; cvtss2si Rq(reg as u8), xmm1
; cvttss2si Rq(reg as u8), xmm1
);
},
WpType::F32,
@ -4565,7 +4581,7 @@ impl FunctionCodeGenerator for X64FunctionCode {
; movq xmm1, Rq(reg as u8)
; mov rax, QWORD 0x7fffffffffffffff
; movq xmm2, rax
; por xmm1, xmm2
; pand xmm1, xmm2
; movq Rq(reg as u8), xmm1
);
},
@ -4666,8 +4682,8 @@ impl FunctionCodeGenerator for X64FunctionCode {
dynasm!(
assembler
; movq xmm1, Rq(reg as u8)
; roundsd xmm1, xmm1, 3
; cvtsd2si Rd(reg as u8), xmm1
; cvttsd2si Rq(reg as u8), xmm1
; mov Rd(reg as u8), Rd(reg as u8)
);
},
WpType::F64,
@ -4689,8 +4705,7 @@ impl FunctionCodeGenerator for X64FunctionCode {
dynasm!(
assembler
; movq xmm1, Rq(reg as u8)
; roundsd xmm1, xmm1, 3
; cvtsd2si Rd(reg as u8), xmm1
; cvttsd2si Rd(reg as u8), xmm1
);
},
WpType::F64,
@ -4709,11 +4724,34 @@ impl FunctionCodeGenerator for X64FunctionCode {
18446744073709551616.0,
);
/*
LCPI0_0:
.quad 4890909195324358656 ## double 9.2233720368547758E+18
movsd LCPI0_0(%rip), %xmm1 ## xmm1 = mem[0],zero
movapd %xmm0, %xmm2
subsd %xmm1, %xmm2
cvttsd2si %xmm2, %rax
movabsq $-9223372036854775808, %rcx ## imm = 0x8000000000000000
xorq %rax, %rcx
cvttsd2si %xmm0, %rax
ucomisd %xmm1, %xmm0
cmovaeq %rcx, %rax
*/
dynasm!(
assembler
; movq xmm1, Rq(reg as u8)
; roundsd xmm1, xmm1, 3
; cvtsd2si Rq(reg as u8), xmm1
; mov r13, QWORD 4890909195324358656u64 as i64 //double 9.2233720368547758E+18
; movq xmm1, r13
; movq xmm2, Rq(reg as u8)
; movq xmm3, Rq(reg as u8)
; subsd xmm2, xmm1
; cvttsd2si Rq(reg as u8), xmm2
; mov r13, QWORD 0x8000000000000000u64 as i64
; xor r13, Rq(reg as u8)
; cvttsd2si Rq(reg as u8), xmm3
; ucomisd xmm3, xmm1
; cmovae Rq(reg as u8), r13
);
},
WpType::F64,
@ -4735,8 +4773,7 @@ impl FunctionCodeGenerator for X64FunctionCode {
dynasm!(
assembler
; movq xmm1, Rq(reg as u8)
; roundsd xmm1, xmm1, 3
; cvtsd2si Rq(reg as u8), xmm1
; cvttsd2si Rq(reg as u8), xmm1
);
},
WpType::F64,