diff options
| author | José Fonseca <[email protected]> | 2010-10-08 17:37:18 +0100 |
|---|---|---|
| committer | José Fonseca <[email protected]> | 2010-10-08 17:43:15 +0100 |
| commit | 6b0c79e058d4d008cad32c0ff06de9757ccd6fa0 (patch) | |
| tree | b76b48ff5a8969ec9e773ab9c899294c4c985824 /src | |
| parent | d5ef59d8b0ce2ea8f0ad983951e696d1679e3eb7 (diff) | |
gallivm: Warn when doing inefficient integer comparisons.
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_logic.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_logic.c b/src/gallium/auxiliary/gallivm/lp_bld_logic.c index d5c62a3f734..ce5d0214b43 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_logic.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_logic.c @@ -92,9 +92,23 @@ lp_build_compare(LLVMBuilderRef builder, if(func == PIPE_FUNC_ALWAYS) return ones; - /* TODO: optimize the constant case */ +#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64) + /* + * There are no unsigned integer comparison instructions in SSE. + */ - /* XXX: It is not clear if we should use the ordered or unordered operators */ + if (!type.floating && !type.sign && + type.width * type.length == 128 && + util_cpu_caps.has_sse2 && + (func == PIPE_FUNC_LESS || + func == PIPE_FUNC_LEQUAL || + func == PIPE_FUNC_GREATER || + func == PIPE_FUNC_GEQUAL) && + (gallivm_debug & GALLIVM_DEBUG_PERF)) { + debug_printf("%s: inefficient <%u x i%u> unsigned comparison\n", + __FUNCTION__, type.length, type.width); + } +#endif #if HAVE_LLVM < 0x0207 #if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64) @@ -225,6 +239,8 @@ lp_build_compare(LLVMBuilderRef builder, #endif #endif /* HAVE_LLVM < 0x0207 */ + /* XXX: It is not clear if we should use the ordered or unordered operators */ + if(type.floating) { LLVMRealPredicate op; switch(func) { |