diff options
Diffstat (limited to 'src/amd/common/ac_llvm_build.c')
| -rw-r--r-- | src/amd/common/ac_llvm_build.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c index 0a02ee38c1..1fe36de6e1 100644 --- a/src/amd/common/ac_llvm_build.c +++ b/src/amd/common/ac_llvm_build.c @@ -2376,3 +2376,22 @@ LLVMValueRef ac_cast_ptr(struct ac_llvm_context *ctx, LLVMValueRef ptr, return LLVMBuildBitCast(ctx->builder, ptr, LLVMPointerType(type, addr_space), ""); } + +LLVMValueRef ac_trim_vector(struct ac_llvm_context *ctx, LLVMValueRef value, + unsigned count) +{ + unsigned num_components = ac_get_llvm_num_components(value); + if (count == num_components) + return value; + + LLVMValueRef masks[] = { + LLVMConstInt(ctx->i32, 0, false), LLVMConstInt(ctx->i32, 1, false), + LLVMConstInt(ctx->i32, 2, false), LLVMConstInt(ctx->i32, 3, false)}; + + if (count == 1) + return LLVMBuildExtractElement(ctx->builder, value, masks[0], + ""); + + LLVMValueRef swizzle = LLVMConstVector(masks, count); + return LLVMBuildShuffleVector(ctx->builder, value, value, swizzle, ""); +} |