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radv/ac: use shared umsb helper. 

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 03:54:01 +00:00
parent 0ec66b9969
commit ebed22ec67
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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@ -936,23 +936,7 @@ static LLVMValueRef emit_ifind_msb(struct nir_to_llvm_context *ctx,
static LLVMValueRef emit_ufind_msb(struct nir_to_llvm_context *ctx,
LLVMValueRef src0)
{
LLVMValueRef args[2] = {
src0,
ctx->i32one,
};
LLVMValueRef msb = ac_emit_llvm_intrinsic(&ctx->ac, "llvm.ctlz.i32",
ctx->i32, args, ARRAY_SIZE(args),
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, "");
return LLVMBuildSelect(ctx->builder,
LLVMBuildICmp(ctx->builder, LLVMIntEQ, src0,
ctx->i32zero, ""),
LLVMConstInt(ctx->i32, -1, true), msb, "");
return ac_emit_umsb(&ctx->ac, src0, ctx->i32);
}
static LLVMValueRef emit_minmax_int(struct nir_to_llvm_context *ctx,