diff options
Diffstat (limited to 'src/runtime/sys_windows_amd64.s')
| -rw-r--r-- | src/runtime/sys_windows_amd64.s | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/src/runtime/sys_windows_amd64.s b/src/runtime/sys_windows_amd64.s index c1b78e3976..56a2dc0bcf 100644 --- a/src/runtime/sys_windows_amd64.s +++ b/src/runtime/sys_windows_amd64.s @@ -33,14 +33,12 @@ TEXT runtime·asmstdcall(SB),NOSPLIT,$16 SUBQ $(const_maxArgs*8), SP // room for args - // Fast version, do not store args on the stack nor - // load them into registers. - CMPL CX, $0 - JE docall - // Fast version, do not store args on the stack. - CMPL CX, $4 - JLE loadregs + CMPL CX, $0; JE _0args + CMPL CX, $1; JE _1args + CMPL CX, $2; JE _2args + CMPL CX, $3; JE _3args + CMPL CX, $4; JE _4args // Check we have enough room for args. CMPL CX, $const_maxArgs @@ -53,22 +51,25 @@ TEXT runtime·asmstdcall(SB),NOSPLIT,$16 REP; MOVSQ MOVQ SP, SI -loadregs: // Load first 4 args into correspondent registers. - MOVQ 0(SI), CX - MOVQ 8(SI), DX - MOVQ 16(SI), R8 - MOVQ 24(SI), R9 // Floating point arguments are passed in the XMM // registers. Set them here in case any of the arguments // are floating point values. For details see // https://learn.microsoft.com/en-us/cpp/build/x64-calling-convention?view=msvc-170 - MOVQ CX, X0 - MOVQ DX, X1 - MOVQ R8, X2 +_4args: + MOVQ 24(SI), R9 MOVQ R9, X3 +_3args: + MOVQ 16(SI), R8 + MOVQ R8, X2 +_2args: + MOVQ 8(SI), DX + MOVQ DX, X1 +_1args: + MOVQ 0(SI), CX + MOVQ CX, X0 +_0args: -docall: // Call stdcall function. CALL AX |