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-rw-r--r--src/gallium/drivers/llvmpipe/lp_jit.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_jit.c b/src/gallium/drivers/llvmpipe/lp_jit.c
index 5d2cf01e5b..1126bf90b9 100644
--- a/src/gallium/drivers/llvmpipe/lp_jit.c
+++ b/src/gallium/drivers/llvmpipe/lp_jit.c
@@ -150,6 +150,12 @@ lp_jit_screen_init(struct llvmpipe_screen *screen)
util_cpu_detect();
+#if 0
+ /* For simulating less capable machines */
+ util_cpu_caps.has_sse3 = 0;
+ util_cpu_caps.has_sse4_1 = 0;
+#endif
+
#ifdef LLVM_NATIVE_ARCH
LLVMLinkInJIT();
LLVMInitializeNativeTarget();
@@ -171,8 +177,15 @@ lp_jit_screen_init(struct llvmpipe_screen *screen)
LLVMAddTargetData(screen->target, screen->pass);
/* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
* but there are more on SVN. */
+ /* TODO: Add more passes */
LLVMAddConstantPropagationPass(screen->pass);
- LLVMAddInstructionCombiningPass(screen->pass);
+ if(util_cpu_caps.has_sse4_1) {
+ /* FIXME: There is a bug in this pass, whereby the combination of fptosi
+ * and sitofp (necessary for trunc/floor/ceil/round implementation)
+ * somehow becomes invalid code.
+ */
+ LLVMAddInstructionCombiningPass(screen->pass);
+ }
LLVMAddPromoteMemoryToRegisterPass(screen->pass);
LLVMAddGVNPass(screen->pass);
LLVMAddCFGSimplificationPass(screen->pass);