diff options
| -rw-r--r-- | src/mesa/drivers/dri/r300/compiler/radeon_optimize.c | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c index b24274259f4..39dcb21d4f4 100644 --- a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c +++ b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c @@ -561,28 +561,29 @@ static int peephole_add_presub_add( struct rc_instruction * inst_add) { unsigned dstmask = inst_add->U.I.DstReg.WriteMask; - struct rc_src_register * src1 = NULL; - unsigned int i; - - if (!is_presub_candidate(c, inst_add)) - return 0; + unsigned src0_neg = inst_add->U.I.SrcReg[0].Negate & dstmask; + unsigned src1_neg = inst_add->U.I.SrcReg[1].Negate & dstmask; if (inst_add->U.I.SrcReg[0].Swizzle != inst_add->U.I.SrcReg[1].Swizzle) return 0; - /* XXX This isn't fully implemented, is it? */ - /* src0 and src1 can't have absolute values only one can be negative and they must be all negative or all positive. */ - for (i = 0; i < 2; i++) { - if (inst_add->U.I.SrcReg[i].Abs) - return 0; + /* src0 and src1 can't have absolute values */ + if (inst_add->U.I.SrcReg[0].Abs || inst_add->U.I.SrcReg[1].Abs) + return 0; - /* XXX This looks weird, but it's basically what was here before this commit (see git blame): */ - if ((inst_add->U.I.SrcReg[i].Negate & dstmask) != dstmask && !src1) { - src1 = &inst_add->U.I.SrcReg[i]; - } - } + /* presub_replace_add() assumes only one is negative */ + if (inst_add->U.I.SrcReg[0].Negate && inst_add->U.I.SrcReg[1].Negate) + return 0; + + /* if src0 is negative, at least all bits of dstmask have to be set */ + if (inst_add->U.I.SrcReg[0].Negate && src0_neg != dstmask) + return 0; - if (!src1) + /* if src1 is negative, at least all bits of dstmask have to be set */ + if (inst_add->U.I.SrcReg[1].Negate && src1_neg != dstmask) + return 0; + + if (!is_presub_candidate(c, inst_add)) return 0; if (presub_helper(c, inst_add, RC_PRESUB_ADD, presub_replace_add)) { @@ -615,7 +616,7 @@ static void presub_replace_inv( * of the add instruction must have the constatnt 1 swizzle. This function * does not check const registers to see if their value is 1.0, so it should * be called after the constant_folding optimization. - * @return + * @return * 0 if the ADD instruction is still part of the program. * 1 if the ADD instruction is no longer part of the program. */ |