This series is, Reviewed-by: Edward O'Callaghan <[email protected]>
On 02/16/2017 02:55 PM, Dave Airlie wrote: > From: Dave Airlie <[email protected]> > > Since we shared imsb, makes sense to share umsb. > > Signed-off-by: Dave Airlie <[email protected]> > --- > src/amd/common/ac_llvm_build.c | 25 +++++++++++++++++++++++++ > src/amd/common/ac_llvm_build.h | 4 ++++ > 2 files changed, 29 insertions(+) > > diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c > index dda2c0b..ed31a56 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 0ff04e4..3258e5e 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 >
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