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radeon/ac: add ac_emit_imsb helper.

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We want to use a different intrinsic on newer llvm, so move this
code to a shared area.

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 03:42:56 +00:00
parent 40bf7ba023
commit cae1ff1a4b
2 changed files with 28 additions and 0 deletions
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24
src/amd/common/ac_llvm_build.c
View file

@ -763,3 +763,27 @@ ac_emit_sendmsg(struct ac_llvm_context *ctx,
ac_emit_llvm_intrinsic(ctx, intr_name, ctx->voidt,
args, 2, 0);
}
LLVMValueRef
ac_emit_imsb(struct ac_llvm_context *ctx,
LLVMValueRef arg,
LLVMTypeRef dst_type)
{
LLVMValueRef msb = ac_emit_llvm_intrinsic(ctx, "llvm.AMDGPU.flbit.i32",
dst_type, &arg, 1,
AC_FUNC_ATTR_READNONE);
/* The HW returns the last bit index from MSB, but NIR/TGSI 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,
arg, LLVMConstInt(ctx->i32, 0, 0), ""),
LLVMBuildICmp(ctx->builder, LLVMIntEQ,
arg, all_ones, ""), "");
return LLVMBuildSelect(ctx->builder, cond, all_ones, msb, "");
}

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

@ -182,6 +182,10 @@ void ac_emit_sendmsg(struct ac_llvm_context *ctx,
uint32_t msg,
LLVMValueRef wave_id);
LLVMValueRef ac_emit_imsb(struct ac_llvm_context *ctx,
LLVMValueRef arg,
LLVMTypeRef dst_type);
#ifdef __cplusplus
}
#endif