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radeon/ac: add emit umsb shared code.

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Since we shared imsb, makes sense to share umsb.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2017-02-16 03:53:27 +00:00
parent 4617ad07e0
commit 0ec66b9969
2 changed files with 29 additions and 0 deletions
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25
src/amd/common/ac_llvm_build.c
View file

@ -788,3 +788,28 @@ ac_emit_imsb(struct ac_llvm_context *ctx,
return LLVMBuildSelect(ctx->builder, cond, all_ones, msb, "");
}
LLVMValueRef
ac_emit_umsb(struct ac_llvm_context *ctx,
LLVMValueRef arg,
LLVMTypeRef dst_type)
{
LLVMValueRef args[2] = {
arg,
LLVMConstInt(ctx->i32, 1, 0),
};
LLVMValueRef msb = ac_emit_llvm_intrinsic(ctx, "llvm.ctlz.i32",
dst_type, args, ARRAY_SIZE(args),
AC_FUNC_ATTR_READNONE);
/* The HW returns the last bit index from MSB, but TGSI/NIR wants
* the index from LSB. Invert it by doing "31 - msb". */
msb = LLVMBuildSub(ctx->builder, LLVMConstInt(ctx->i32, 31, false),
msb, "");
/* check for zero */
return LLVMBuildSelect(ctx->builder,
LLVMBuildICmp(ctx->builder, LLVMIntEQ, arg,
LLVMConstInt(ctx->i32, 0, 0), ""),
LLVMConstInt(ctx->i32, -1, true), msb, "");
}

4
src/amd/common/ac_llvm_build.h
View file

@ -186,6 +186,10 @@ LLVMValueRef ac_emit_imsb(struct ac_llvm_context *ctx,
LLVMValueRef arg,
LLVMTypeRef dst_type);
LLVMValueRef ac_emit_umsb(struct ac_llvm_context *ctx,
LLVMValueRef arg,
LLVMTypeRef dst_type);
#ifdef __cplusplus
}
#endif