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r600g: introduce r600_bc_src_toggle_neg helper and fix SUB & LRP

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SUB & LRP instructions should toggle NEG bit instead of setting it,
otherwise e.g. "SUB a,b,-1" is translated as "ADD a,b,-1"

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
This commit is contained in:
Vadim Girlin
2011-07-08 06:19:37 +04:00
committed by Alex Deucher
parent f87d566f4b
commit 3efb47f0b0
1 changed files with 7 additions and 2 deletions
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9
src/gallium/drivers/r600/r600_shader.c
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@@ -945,6 +945,11 @@ static void r600_bc_src_set_abs(struct r600_bc_alu_src *bc_src)
bc_src->neg = 0;
}
static void r600_bc_src_toggle_neg(struct r600_bc_alu_src *bc_src)
{
bc_src->neg = !bc_src->neg;
}
static void tgsi_dst(struct r600_shader_ctx *ctx,
const struct tgsi_full_dst_register *tgsi_dst,
unsigned swizzle,
@@ -1001,7 +1006,7 @@ static int tgsi_op2_s(struct r600_shader_ctx *ctx, int swap)
/* handle some special cases */
switch (ctx->inst_info->tgsi_opcode) {
case TGSI_OPCODE_SUB:
alu.src[1].neg = 1;
r600_bc_src_toggle_neg(&alu.src[1]);
break;
case TGSI_OPCODE_ABS:
r600_bc_src_set_abs(&alu.src[0]);
@@ -2195,7 +2200,7 @@ static int tgsi_lrp(struct r600_shader_ctx *ctx)
alu.src[0].sel = V_SQ_ALU_SRC_1;
alu.src[0].chan = 0;
r600_bc_src(&alu.src[1], &ctx->src[0], i);
alu.src[1].neg = 1;
r600_bc_src_toggle_neg(&alu.src[1]);
alu.dst.sel = ctx->temp_reg;
alu.dst.chan = i;
if (i == lasti) {