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llvmpipe: fix vertex_header mask store in big-endian 

This patch fixes the vertex_header mask bitfield store in big-endian
architectures by bit-swap the fields accordingly.

Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adhemerval Zanella 2013-01-20 11:42:16 -06:00 committed by Adam Jackson
parent a8016b2f60
commit 1ab2c55bf4
1 changed files with 48 additions and 0 deletions
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48
src/gallium/auxiliary/draw/draw_llvm.c
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@ -646,6 +646,53 @@ store_aos(struct gallivm_state *gallivm,
lp_set_store_alignment(LLVMBuildStore(builder, value, data_ptr), sizeof(float));
}
/**
* Adjust the mask to architecture endianess. The mask will the store in struct:
*
* struct vertex_header {
* unsigned clipmask:DRAW_TOTAL_CLIP_PLANES;
* unsigned edgeflag:1;
* unsigned have_clipdist:1;
* unsigned vertex_id:16;
* [...]
* }
*
* On little-endian machine nothing needs to done, however on bit-endian machine
* the mask's fields need to be adjusted with the algorithm:
*
* uint32_t reverse (uint32_t x)
* {
* return (x >> 16) | // vertex_id
* ((x & 0x3fff) << 18) | // clipmask
* ((x & 0x4000) << 3) | // have_clipdist
* ((x & 0x8000) << 1); // edgeflag
* }
*/
static LLVMValueRef
adjust_mask(struct gallivm_state *gallivm,
LLVMValueRef mask)
{
#ifdef PIPE_ARCH_BIG_ENDIAN
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef vertex_id;
LLVMValueRef clipmask;
LLVMValueRef have_clipdist;
LLVMValueRef edgeflag;
vertex_id = LLVMBuildLShr(builder, mask, lp_build_const_int32(gallivm, 16), "");
clipmask = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x3fff), "");
clipmask = LLVMBuildShl(builder, clipmask, lp_build_const_int32(gallivm, 18), "");
have_clipdist = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x4000), "");
have_clipdist = LLVMBuildShl(builder, have_clipdist, lp_build_const_int32(gallivm, 3), "");
edgeflag = LLVMBuildAnd(builder, mask, lp_build_const_int32(gallivm, 0x8000), "");
edgeflag = LLVMBuildShl(builder, edgeflag, lp_build_const_int32(gallivm, 1), "");
mask = LLVMBuildOr(builder, vertex_id, clipmask, "");
mask = LLVMBuildOr(builder, mask, have_clipdist, "");
mask = LLVMBuildOr(builder, mask, edgeflag, "");
#endif
return mask;
}
static void
store_aos_array(struct gallivm_state *gallivm,
@ -690,6 +737,7 @@ store_aos_array(struct gallivm_state *gallivm,
for (i = 0; i < vector_length; i++) {
LLVMValueRef id_ptr = draw_jit_header_id(gallivm, io_ptrs[i]);
val = LLVMBuildExtractElement(builder, cliptmp, inds[i], "");
val = adjust_mask(gallivm, val);
LLVMBuildStore(builder, val, id_ptr);
#if DEBUG_STORE
lp_build_printf(gallivm, "io = %p, index %d\n, clipmask = %x\n",