diff options
| author | Dave Airlie <[email protected]> | 2017-02-16 03:53:27 +0000 |
|---|---|---|
| committer | Dave Airlie <[email protected]> | 2017-02-16 22:57:16 +0000 |
| commit | 0ec66b99691ab8a09d2e16bd562b700a6624579e (patch) | |
| tree | 272f2c475a990d2c45a8cdd5e4e0211b0b320564 /src/amd/common | |
| parent | 4617ad07e066c70950a1ace34ab62b6209db8836 (diff) | |
radeon/ac: add emit umsb shared code.
Since we shared imsb, makes sense to share umsb.
Reviewed-by: Edward O'Callaghan <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Diffstat (limited to 'src/amd/common')
| -rw-r--r-- | src/amd/common/ac_llvm_build.c | 25 | ||||
| -rw-r--r-- | src/amd/common/ac_llvm_build.h | 4 |
2 files changed, 29 insertions, 0 deletions
diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c index dda2c0b9421..ed31a5606e8 100644 --- a/src/amd/common/ac_llvm_build.c +++ b/src/amd/common/ac_llvm_build.c @@ -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, ""); +} diff --git a/src/amd/common/ac_llvm_build.h b/src/amd/common/ac_llvm_build.h index 0ff04e4c703..3258e5ef54a 100644 --- a/src/amd/common/ac_llvm_build.h +++ b/src/amd/common/ac_llvm_build.h @@ -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 |