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| author | ptitSeb <sebastien.chev@gmail.com> | 2024-01-27 17:00:34 +0100 |
|---|---|---|
| committer | ptitSeb <sebastien.chev@gmail.com> | 2024-01-27 17:00:34 +0100 |
| commit | 1680dc63d939132bbc6193dfd2e228961d53f06c (patch) | |
| tree | a507604b7d3d89d6974d1d8ee8bbb237e50d854e | |
| parent | 806298843faf97083f3d6572e40ef044d4c077ab (diff) | |
| download | box64-1680dc63d939132bbc6193dfd2e228961d53f06c.tar.gz box64-1680dc63d939132bbc6193dfd2e228961d53f06c.zip | |
[ARM64_DYNAREC] Improved shld16 opcode
| -rw-r--r-- | src/dynarec/arm64/dynarec_arm64_emit_shift.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/src/dynarec/arm64/dynarec_arm64_emit_shift.c b/src/dynarec/arm64/dynarec_arm64_emit_shift.c index c832da6c..2e365748 100644 --- a/src/dynarec/arm64/dynarec_arm64_emit_shift.c +++ b/src/dynarec/arm64/dynarec_arm64_emit_shift.c @@ -1307,9 +1307,8 @@ void emit_shld16c(dynarec_arm_t* dyn, int ninst, int s1, int s2, uint32_t c, int COMP_ZFSF(s1, 16) IFX(X_OF) { if(c==1) { - LSRw(s3, s1, 15); - EORw_REG_LSR(s3, s3, xFlags, F_OF); // OF is set if sign changed - BFIw(xFlags, s3, F_OF, 1); + UBFXw(s3, s1, 15, 1); + EORw_REG_LSL(xFlags, xFlags, s3, F_OF); // OF is set if sign changed } else { BFCw(xFlags, F_OF, 1); } @@ -1335,11 +1334,11 @@ void emit_shld16(dynarec_arm_t* dyn, int ninst, int s1, int s2, int s5, int s3, RORw_REG(s3, s4, s3); BFIw(xFlags, s3, F_CF, 1); } - ORRw_REG_LSL(s1, s1, s2, 16); // create concat first IFX(X_OF) { LSRw(s3, s1, 15); BFIw(xFlags, s3, F_OF, 1); // store current sign for later use } + ORRw_REG_LSL(s1, s1, s2, 16); // create concat first MOV32w(s3, 32); SUBw_REG(s3, s3, s5); RORw_REG(s1, s1, s3); @@ -1350,10 +1349,9 @@ void emit_shld16(dynarec_arm_t* dyn, int ninst, int s1, int s2, int s5, int s3, COMP_ZFSF(s1, 16) IFX(X_OF) { CMPSw_U12(s5, 1); - Bcond(cNE, 4+3*4); - LSRw(s3, s1, 15); - EORw_REG_LSR(s3, s3, xFlags, F_OF); // OF is set if sign changed - BFIw(xFlags, s3, F_OF, 1); + Bcond(cNE, 4+2*4); + UBFXw(s3, s1, 15, 1); + EORw_REG_LSL(xFlags, xFlags, s3, F_OF); // OF is set if sign changed } IFX(X_PF) { emit_pf(dyn, ninst, s1, s3, s4); |