[Mesa-dev] [PATCH 22/38] ac/nir: implement 8 and 16 bit ac_build_readlane

[Rhys Perry]

Signed-off-by: Rhys Perry <pendingchao...@gmail.com>
---
 src/amd/common/ac_llvm_build.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
index f394d16bc9..6266058b77 100644
--- a/src/amd/common/ac_llvm_build.c
+++ b/src/amd/common/ac_llvm_build.c
@@ -3149,9 +3149,15 @@ ac_build_readlane(struct ac_llvm_context *ctx, 
LLVMValueRef src, LLVMValueRef la
 {
        LLVMTypeRef src_type = LLVMTypeOf(src);
        src = ac_to_integer(ctx, src);
-       unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
+       unsigned src_bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
+       unsigned bits = src_bits;
        LLVMValueRef ret;
 
+       if (bits < 32) {
+               src = LLVMBuildZExt(ctx->builder, src, ctx->i32, "");
+               bits = 32;
+       }
+
        if (bits == 32) {
                ret = _ac_build_readlane(ctx, src, lane);
        } else {
@@ -3168,6 +3174,10 @@ ac_build_readlane(struct ac_llvm_context *ctx, 
LLVMValueRef src, LLVMValueRef la
                                                LLVMConstInt(ctx->i32, i, 0), 
"");
                }
        }
+
+       if (src_bits < 32)
+               ret = LLVMBuildTrunc(ctx->builder, ret, ac_int_of_size(ctx, 
src_bits), "");
+
        return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
 }
 
-- 
2.19.2

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