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gallivm: Workaround LLVM PR 27332. 

The credit for finding and isolating this bug goes to Vinson and Roland.

The buggy LLVM versions were found by doing

  opt -instcombine llvm-pr27332.ll > /dev/null

where llvm-pr27332.ll is the IR from
https://llvm.org/bugs/show_bug.cgi?id=27332#c3

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Jose Fonseca 2016-04-13 15:41:55 +01:00
parent dd0a296895
commit 9586468c03
1 changed files with 14 additions and 3 deletions
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17
src/gallium/auxiliary/gallivm/lp_bld_arit.c
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@ -1492,9 +1492,20 @@ lp_build_abs(struct lp_build_context *bld,
return a;
if(type.floating) {
char intrinsic[32];
lp_format_intrinsic(intrinsic, sizeof intrinsic, "llvm.fabs", vec_type);
return lp_build_intrinsic_unary(builder, intrinsic, vec_type, a);
if (0x0306 <= HAVE_LLVM && HAVE_LLVM < 0x0309) {
/* Workaround llvm.org/PR27332 */
LLVMTypeRef int_vec_type = lp_build_int_vec_type(bld->gallivm, type);
unsigned long long absMask = ~(1ULL << (type.width - 1));
LLVMValueRef mask = lp_build_const_int_vec(bld->gallivm, type, ((unsigned long long) absMask));
a = LLVMBuildBitCast(builder, a, int_vec_type, "");
a = LLVMBuildAnd(builder, a, mask, "");
a = LLVMBuildBitCast(builder, a, vec_type, "");
return a;
} else {
char intrinsic[32];
lp_format_intrinsic(intrinsic, sizeof intrinsic, "llvm.fabs", vec_type);
return lp_build_intrinsic_unary(builder, intrinsic, vec_type, a);
}
}
if(type.width*type.length == 128 && util_cpu_caps.has_ssse3) {