gallivm: Never emit llvm.fmuladd on LLVM 3.3.

Besides the old JIT bug, it seems the X86 backend on LLVM 3.3 doesn't
handle llvm.fmuladd and instead it fall backs to a C function.  Which in
turn causes a segfault on Windows.

Reviewed-by: Roland Scheidegger <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
index 5d6a0335654..114c76665f9 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -270,6 +270,12 @@ lp_build_fmuladd(LLVMBuilderRef builder,
    LLVMTypeRef type = LLVMTypeOf(a);
    assert(type == LLVMTypeOf(b));
    assert(type == LLVMTypeOf(c));
+   if (HAVE_LLVM < 0x0304) {
+      /* XXX: LLVM 3.3 does not breakdown llvm.fmuladd into mul+add when FMA is
+       * not supported, and instead it falls-back to a C function.
+       */
+      return LLVMBuildFAdd(builder, LLVMBuildFMul(builder, a, b, ""), c, "");
+   }
    char intrinsic[32];
    lp_format_intrinsic(intrinsic, sizeof intrinsic, "llvm.fmuladd", type);
    LLVMValueRef args[] = { a, b, c };