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radv/ac: use shader imsb emission code.

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Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2017-02-16 03:43:29 +00:00
parent cae1ff1a4b
commit fb15a1e9dd
1 changed files with 1 additions and 17 deletions
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18
src/amd/common/ac_nir_to_llvm.c
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@ -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,