diff options
| author | Sintendo <bram.speeckaert@gmail.com> | 2020-11-15 13:04:57 +0100 |
|---|---|---|
| committer | Sintendo <bram.speeckaert@gmail.com> | 2020-12-25 19:30:51 +0100 |
| commit | 2e4e2ad1ffc92ac76498f926ca88637d098ea747 (patch) | |
| tree | 98e8050340755c39a1e1e28db2160841a8e60f3b /Source | |
| parent | 6ddf69d0940b193cad1fb97356bf175a8c4388ab (diff) | |
Jit64: subfic - Handle constants
Occurs surprisingly often. Prevents generating silly code like this:
BE 03 00 00 00 mov esi,3
83 EE 08 sub esi,8
0F 93 45 58 setae byte ptr [rbp+58h]
Diffstat (limited to 'Source')
| -rw-r--r-- | Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp b/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp index 74362c12c1..12e46b0530 100644 --- a/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp +++ b/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp @@ -862,13 +862,20 @@ void Jit64::subfic(UGeckoInstruction inst) { INSTRUCTION_START JITDISABLE(bJITIntegerOff); - int a = inst.RA, d = inst.RD; + int a = inst.RA, d = inst.RD, imm = inst.SIMM_16; + + if (gpr.IsImm(a)) + { + u32 i = imm, j = gpr.Imm32(a); + gpr.SetImmediate32(d, i - j); + FinalizeCarry(j == 0 || (i > j - 1)); + return; + } RCOpArg Ra = gpr.Use(a, RCMode::Read); RCX64Reg Rd = gpr.Bind(d, RCMode::Write); RegCache::Realize(Ra, Rd); - int imm = inst.SIMM_16; if (d == a) { if (imm == 0) |