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ac: add 8-bit support to ac_build_umsb()

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Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset 2019-04-01 16:18:09 +02:00
parent a45d9e3e8d
commit 2cecf6c5cc
1 changed files with 7 additions and 1 deletions
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8
src/amd/common/ac_llvm_build.c
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@ -1953,6 +1953,12 @@ ac_build_umsb(struct ac_llvm_context *ctx,
highest_bit = LLVMConstInt(ctx->i16, 15, false);
zero = ctx->i16_0;
break;
case 8:
intrin_name = "llvm.ctlz.i8";
type = ctx->i8;
highest_bit = LLVMConstInt(ctx->i8, 7, false);
zero = ctx->i8_0;
break;
default:
unreachable(!"invalid bitsize");
break;
@ -1973,7 +1979,7 @@ ac_build_umsb(struct ac_llvm_context *ctx,
if (bitsize == 64) {
msb = LLVMBuildTrunc(ctx->builder, msb, ctx->i32, "");
} else if (bitsize == 16) {
} else if (bitsize < 32) {
msb = LLVMBuildSExt(ctx->builder, msb, ctx->i32, "");
}