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authorJosé Fonseca <jfonseca@vmware.com>2009-08-20 20:17:55 +0100
committerJosé Fonseca <jfonseca@vmware.com>2009-08-29 09:21:37 +0100
commitd07b0383660cd318ba43abad11bb80de4a124951 (patch)
treebfaf13e65c6fa3158da634a71363b0db0747da3b /src/gallium
parent89146cd48d37aed0e710d7d935be90b342309f0e (diff)
llvmpipe: Generate instrinsics for integer comparisons.
It is a little messy, given the available instrucions form SIMD integer comparisons is rather limited.
Diffstat (limited to 'src/gallium')
-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_logic.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_logic.c b/src/gallium/drivers/llvmpipe/lp_bld_logic.c
index 95d7f8c5ba..5b8efb0577 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_logic.c
+++ b/src/gallium/drivers/llvmpipe/lp_bld_logic.c
@@ -107,6 +107,77 @@ lp_build_cmp(struct lp_build_context *bld,
res = LLVMBuildBitCast(bld->builder, res, int_vec_type, "");
return res;
}
+ else {
+ static const struct {
+ unsigned swap:1;
+ unsigned eq:1;
+ unsigned gt:1;
+ unsigned not:1;
+ } table[] = {
+ {0, 0, 0, 1}, /* PIPE_FUNC_NEVER */
+ {1, 0, 1, 0}, /* PIPE_FUNC_LESS */
+ {0, 1, 0, 0}, /* PIPE_FUNC_EQUAL */
+ {0, 0, 1, 1}, /* PIPE_FUNC_LEQUAL */
+ {0, 0, 1, 0}, /* PIPE_FUNC_GREATER */
+ {0, 1, 0, 1}, /* PIPE_FUNC_NOTEQUAL */
+ {1, 0, 1, 1}, /* PIPE_FUNC_GEQUAL */
+ {0, 0, 0, 0} /* PIPE_FUNC_ALWAYS */
+ };
+ const char *pcmpeq;
+ const char *pcmpgt;
+ LLVMValueRef args[2];
+ LLVMValueRef res;
+
+ switch (type.width) {
+ case 8:
+ pcmpeq = "llvm.x86.sse2.pcmpeq.b";
+ pcmpgt = "llvm.x86.sse2.pcmpgt.b";
+ break;
+ case 16:
+ pcmpeq = "llvm.x86.sse2.pcmpeq.w";
+ pcmpgt = "llvm.x86.sse2.pcmpgt.w";
+ break;
+ case 32:
+ pcmpeq = "llvm.x86.sse2.pcmpeq.d";
+ pcmpgt = "llvm.x86.sse2.pcmpgt.d";
+ break;
+ default:
+ assert(0);
+ return bld->undef;
+ }
+
+ /* There are no signed byte and unsigned word/dword comparison
+ * instructions. So flip the sign bit so that the results match.
+ */
+ if(table[func].gt &&
+ ((type.width == 8 && type.sign) ||
+ (type.width != 8 && !type.sign))) {
+ LLVMValueRef msb = lp_build_int_const_uni(type, (unsigned long long)1 << (type.width - 1));
+ a = LLVMBuildXor(bld->builder, a, msb, "");
+ b = LLVMBuildXor(bld->builder, b, msb, "");
+ }
+
+ if(table[func].swap) {
+ args[0] = b;
+ args[1] = a;
+ }
+ else {
+ args[0] = a;
+ args[1] = b;
+ }
+
+ if(table[func].eq)
+ res = lp_build_intrinsic(bld->builder, pcmpeq, vec_type, args, 2);
+ else if (table[func].gt)
+ res = lp_build_intrinsic(bld->builder, pcmpgt, vec_type, args, 2);
+ else
+ res = LLVMConstNull(vec_type);
+
+ if(table[func].not)
+ res = LLVMBuildNot(bld->builder, res, "");
+
+ return res;
+ }
}
#endif