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Disable gvn non-local speculative loads under asan.
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Authored by aizatsky on Nov 17 2015, 4:44 PM.

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aizatsky retitled this revision from to Disable gvn non-local speculative loads under asan..

aizatsky updated this object.

aizatsky added a subscriber: llvm-commits.

LGTM

This revision is now accepted and ready to land.Nov 17 2015, 5:05 PM

This revision was automatically updated to reflect the committed changes.

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test/

asan/

TestCases/

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				// Verifies that speculative loads from unions do not happen under asan.
				// RUN: %clangxx_asan -O0 %s -o %t && ASAN_OPTIONS=detect_leaks=0 %run %t 2>&1
				// RUN: %clangxx_asan -O1 %s -o %t && ASAN_OPTIONS=detect_leaks=0 %run %t 2>&1
				// RUN: %clangxx_asan -O2 %s -o %t && ASAN_OPTIONS=detect_leaks=0 %run %t 2>&1
				// RUN: %clangxx_asan -O3 %s -o %t && ASAN_OPTIONS=detect_leaks=0 %run %t 2>&1

				typedef union {
				short q;
				struct {
				short x;
				short y;
				int for_alignment;
				} w;
				} U;
				int main() {
				char *buf = new char[2];
				buf[0] = buf[1] = 0x0;
				U u = (U )buf;
				return u->q == 0 ? 0 : u->w.y;
				}