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llvmpipe: Finally found a way to do vector comparisons without using intrinsics.

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Only works well with LLVM >= 2.7
This commit is contained in:
José Fonseca 2010-03-10 20:36:42 +00:00
parent 1ad0a0fd8f
commit a75519cb43
1 changed files with 26 additions and 6 deletions
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32
src/gallium/auxiliary/gallivm/lp_bld_logic.c
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@ -42,6 +42,26 @@
#include "lp_bld_logic.h"
/*
* XXX
*
* Selection with vector conditional like
*
* select <4 x i1> %C, %A, %B
*
* is valid IR (e.g. llvm/test/Assembler/vector-select.ll), but it is not
* supported on any backend.
*
* Expanding the boolean vector to full SIMD register width, as in
*
* sext <4 x i1> %C to <4 x i32>
*
* is valid and supported (e.g., llvm/test/CodeGen/X86/vec_compare.ll), but
* it causes assertion failures in LLVM 2.6. It appears to work correctly on
* LLVM 2.7.
*/
/**
* Build code to compare two values 'a' and 'b' of 'type' using the given func.
* \param func one of PIPE_FUNC_x
@ -74,6 +94,7 @@ lp_build_compare(LLVMBuilderRef builder,
/* XXX: It is not clear if we should use the ordered or unordered operators */
#if !defined(HAVE_LLVM) || HAVE_LLVM < 0x0207
#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
if(type.width * type.length == 128) {
if(type.floating && util_cpu_caps.has_sse) {
@ -200,6 +221,7 @@ lp_build_compare(LLVMBuilderRef builder,
}
} /* if (type.width * type.length == 128) */
#endif
#endif /* HAVE_LLVM < 0x0207 */
if(type.floating) {
LLVMRealPredicate op;
@ -233,10 +255,9 @@ lp_build_compare(LLVMBuilderRef builder,
return lp_build_undef(type);
}
#if 0
/* XXX: Although valid IR, no LLVM target currently support this */
#if HAVE_LLVM >= 0x0207
cond = LLVMBuildFCmp(builder, op, a, b, "");
res = LLVMBuildSelect(builder, cond, ones, zeros, "");
res = LLVMBuildSExt(builder, cond, int_vec_type, "");
#else
res = LLVMGetUndef(int_vec_type);
if (type.length == 1) {
@ -286,10 +307,9 @@ lp_build_compare(LLVMBuilderRef builder,
return lp_build_undef(type);
}
#if 0
/* XXX: Although valid IR, no LLVM target currently support this */
#if HAVE_LLVM >= 0x0207
cond = LLVMBuildICmp(builder, op, a, b, "");
res = LLVMBuildSelect(builder, cond, ones, zeros, "");
res = LLVMBuildSExt(builder, cond, int_vec_type, "");
#else
res = LLVMGetUndef(int_vec_type);
if (type.length == 1) {