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llvm-project/llvm/test/CodeGen/X86/fold-vector-bv-crash.ll

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[SelectionDAG] Unary vector constant folding integer legality fixes This patch fixes issues with vector constant folding not correctly handling scalar input operands if they require implicit truncation - this was tested with llvm-stress as recommended by Patrik H Hagglund. The patch ensures that integer input scalars from a build vector are correctly truncated before folding, and that constant integer scalar results are promoted to a legal type before inclusion in the new folded build vector. I have added another crash test case and also a test for UINT_TO_FP / SINT_TO_FP using an non-truncated scalar input, which was failing before this patch. Differential Revision: http://reviews.llvm.org/D9282 llvm-svn: 236308
2015-05-01 16:20:04 +08:00
; RUN: llc < %s -mtriple=i686-unknown -mattr=+avx
; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+avx
;
; llvm-stress generated crash case due to build_vector implicit
; truncation bug from constant folding after legalization.
;
[test] Add explicit dso_local to constant/global variable declarations They are currently implicit because TargetMachine::shouldAssumeDSOLocal implies dso_local. For external data, clang -fno-pic emits the dso_local specifier for ELF and non-MinGW COFF. Adding explicit dso_local makes these tests in align with the clang behavior and helps implementing an option to use GOT indirection for external data access in -fno-pic mode (to avoid copy relocations).
2020-12-05 05:51:01 +08:00
@G = external dso_local global i32
[SelectionDAG] Unary vector constant folding integer legality fixes This patch fixes issues with vector constant folding not correctly handling scalar input operands if they require implicit truncation - this was tested with llvm-stress as recommended by Patrik H Hagglund. The patch ensures that integer input scalars from a build vector are correctly truncated before folding, and that constant integer scalar results are promoted to a legal type before inclusion in the new folded build vector. I have added another crash test case and also a test for UINT_TO_FP / SINT_TO_FP using an non-truncated scalar input, which was failing before this patch. Differential Revision: http://reviews.llvm.org/D9282 llvm-svn: 236308
2015-05-01 16:20:04 +08:00
define void @bv_crash_test() {
%I = insertelement <4 x i64> zeroinitializer, i64 15910, i32 0
%Tr = trunc <4 x i64> %I to <4 x i8>
%Bc = bitcast <4 x i8> %Tr to i32
store volatile i32 %Bc, i32* @G
ret void
}