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authorDave Airlie <[email protected]>2017-02-16 03:43:29 +0000
committerDave Airlie <[email protected]>2017-02-16 22:57:15 +0000
commitfb15a1e9dda17b1006274cdeb1c1410c3f8df0bf (patch)
tree1a970c9e30d859a50a159c86f0e3eba492da804d /src/amd
parentcae1ff1a4b1f696fc6c2496d281c2548a097e753 (diff)
radv/ac: use shader imsb emission code.
Reviewed-by: Edward O'Callaghan <[email protected]> Signed-off-by: Dave Airlie <[email protected]>
Diffstat (limited to 'src/amd')
-rw-r--r--src/amd/common/ac_nir_to_llvm.c18
1 files changed, 1 insertions, 17 deletions
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 883656d5cec..d3c02ceb4a4 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -930,23 +930,7 @@ static LLVMValueRef emit_find_lsb(struct nir_to_llvm_context *ctx,
static LLVMValueRef emit_ifind_msb(struct nir_to_llvm_context *ctx,
LLVMValueRef src0)
{
- LLVMValueRef msb = ac_emit_llvm_intrinsic(&ctx->ac, "llvm.AMDGPU.flbit.i32",
- ctx->i32, &src0, 1,
- AC_FUNC_ATTR_READNONE);
-
- /* The HW returns the last bit index from MSB, but NIR wants
- * the index from LSB. Invert it by doing "31 - msb". */
- msb = LLVMBuildSub(ctx->builder, LLVMConstInt(ctx->i32, 31, false),
- msb, "");
-
- LLVMValueRef all_ones = LLVMConstInt(ctx->i32, -1, true);
- LLVMValueRef cond = LLVMBuildOr(ctx->builder,
- LLVMBuildICmp(ctx->builder, LLVMIntEQ,
- src0, ctx->i32zero, ""),
- LLVMBuildICmp(ctx->builder, LLVMIntEQ,
- src0, all_ones, ""), "");
-
- return LLVMBuildSelect(ctx->builder, cond, all_ones, msb, "");
+ return ac_emit_imsb(&ctx->ac, src0, ctx->i32);
}
static LLVMValueRef emit_ufind_msb(struct nir_to_llvm_context *ctx,