a6728382c6
The compiler does not recognize HACKY_CALL as a call
(we intentionally hide it from the compiler so that it can
compile non-leaf functions as leaf functions).
To compensate for that hacky call thunk saves and restores
all caller-saved registers. However, it saves only
general-purposes registers and does not save XMM registers.
This is a latent bug that was masked up until a recent "NFC" commit
d736002e90 ("tsan: move memory access functions to a separate file"),
which allowed more inlining and exposed the 10-year bug.
Save and restore caller-saved XMM registers (all) as well.
Currently the bug manifests as e.g. frexp interceptor messes the
return value and the added test fails with:
i=8177 y=0.000000 exp=4
Reviewed By: melver
Differential Revision: https://reviews.llvm.org/D113742
21 lines
412 B
C++
21 lines
412 B
C++
// RUN: %clangxx -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main() {
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for (int i = 0; i < 10000; i++) {
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volatile double x = 10;
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int exp = 0;
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double y = frexp(x, &exp);
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if (y != 0.625 || exp != 4) {
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printf("i=%d y=%lf exp=%d\n", i, y, exp);
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exit(1);
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}
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}
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fprintf(stderr, "DONE\n");
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// CHECK: DONE
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return 0;
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}
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