diff options
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_logic.c | 67 | ||||
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_logic.h | 5 |
2 files changed, 50 insertions, 22 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_logic.c b/src/gallium/auxiliary/gallivm/lp_bld_logic.c index 39854e43b19..ab4ddb81c40 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_logic.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_logic.c @@ -363,9 +363,52 @@ lp_build_cmp(struct lp_build_context *bld, /** + * Return (mask & a) | (~mask & b); + */ +LLVMValueRef +lp_build_select_bitwise(struct lp_build_context *bld, + LLVMValueRef mask, + LLVMValueRef a, + LLVMValueRef b) +{ + struct lp_type type = bld->type; + LLVMValueRef res; + + if (a == b) { + return a; + } + + if(type.floating) { + LLVMTypeRef int_vec_type = lp_build_int_vec_type(type); + a = LLVMBuildBitCast(bld->builder, a, int_vec_type, ""); + b = LLVMBuildBitCast(bld->builder, b, int_vec_type, ""); + } + + a = LLVMBuildAnd(bld->builder, a, mask, ""); + + /* This often gets translated to PANDN, but sometimes the NOT is + * pre-computed and stored in another constant. The best strategy depends + * on available registers, so it is not a big deal -- hopefully LLVM does + * the right decision attending the rest of the program. + */ + b = LLVMBuildAnd(bld->builder, b, LLVMBuildNot(bld->builder, mask, ""), ""); + + res = LLVMBuildOr(bld->builder, a, b, ""); + + if(type.floating) { + LLVMTypeRef vec_type = lp_build_vec_type(type); + res = LLVMBuildBitCast(bld->builder, res, vec_type, ""); + } + + return res; +} + + +/** * Return mask ? a : b; * - * mask is a bitwise mask, composed of 0 or ~0 for each element. + * mask is a bitwise mask, composed of 0 or ~0 for each element. Any other value + * will yield unpredictable results. */ LLVMValueRef lp_build_select(struct lp_build_context *bld, @@ -424,27 +467,7 @@ lp_build_select(struct lp_build_context *bld, } } else { - if(type.floating) { - LLVMTypeRef int_vec_type = lp_build_int_vec_type(type); - a = LLVMBuildBitCast(bld->builder, a, int_vec_type, ""); - b = LLVMBuildBitCast(bld->builder, b, int_vec_type, ""); - } - - a = LLVMBuildAnd(bld->builder, a, mask, ""); - - /* This often gets translated to PANDN, but sometimes the NOT is - * pre-computed and stored in another constant. The best strategy depends - * on available registers, so it is not a big deal -- hopefully LLVM does - * the right decision attending the rest of the program. - */ - b = LLVMBuildAnd(bld->builder, b, LLVMBuildNot(bld->builder, mask, ""), ""); - - res = LLVMBuildOr(bld->builder, a, b, ""); - - if(type.floating) { - LLVMTypeRef vec_type = lp_build_vec_type(type); - res = LLVMBuildBitCast(bld->builder, res, vec_type, ""); - } + res = lp_build_select_bitwise(bld, mask, a, b); } return res; diff --git a/src/gallium/auxiliary/gallivm/lp_bld_logic.h b/src/gallium/auxiliary/gallivm/lp_bld_logic.h index 29f9fc3b205..4e7b4c9938e 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_logic.h +++ b/src/gallium/auxiliary/gallivm/lp_bld_logic.h @@ -63,6 +63,11 @@ lp_build_cmp(struct lp_build_context *bld, LLVMValueRef a, LLVMValueRef b); +LLVMValueRef +lp_build_select_bitwise(struct lp_build_context *bld, + LLVMValueRef mask, + LLVMValueRef a, + LLVMValueRef b); LLVMValueRef lp_build_select(struct lp_build_context *bld, |