From: Marek Olšák <marek.ol...@amd.com>
RADV might wanna use this helper too.
---
src/amd/common/ac_llvm_build.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
index 4eebbbd4d9d..0a52c1d68bb 100644
--- a/src/amd/common/ac_llvm_build.c
+++ b/src/amd/common/ac_llvm_build.c
@@ -2584,25 +2584,27 @@ void ac_apply_fmask_to_sample(struct ac_llvm_context
*ac, LLVMValueRef fmask,
LLVMValueRef fmask_value = ac_build_image_opcode(ac, &fmask_load);
fmask_value = LLVMBuildExtractElement(ac->builder, fmask_value,
ac->i32_0, "");
/* Apply the formula. */
unsigned sample_chan = is_array_tex ? 3 : 2;
LLVMValueRef final_sample;
final_sample = LLVMBuildMul(ac->builder, addr[sample_chan],
LLVMConstInt(ac->i32, 4, 0), "");
final_sample = LLVMBuildLShr(ac->builder, fmask_value, final_sample,
"");
+ /* Mask the sample index by 0x7, because 0x8 means an unknown value
+ * with EQAA, so those will map to 0. */
final_sample = LLVMBuildAnd(ac->builder, final_sample,
- LLVMConstInt(ac->i32, 0xF, 0), "");
+ LLVMConstInt(ac->i32, 0x7, 0), "");
/* Don't rewrite the sample index if WORD1.DATA_FORMAT of the FMASK
- * resource descriptor is 0 (invalid),
+ * resource descriptor is 0 (invalid).
*/
LLVMValueRef tmp;
tmp = LLVMBuildBitCast(ac->builder, fmask, ac->v8i32, "");
tmp = LLVMBuildExtractElement(ac->builder, tmp, ac->i32_1, "");
tmp = LLVMBuildICmp(ac->builder, LLVMIntNE, tmp, ac->i32_0, "");
/* Replace the MSAA sample index. */
addr[sample_chan] = LLVMBuildSelect(ac->builder, tmp, final_sample,
addr[sample_chan], "");
}
--
2.17.0
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