[Bug math/19465] New: Wrong code with -Os

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19465

            Bug ID: 19465
           Summary: Wrong code with -Os
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

On x86-64/Ivy Bridge, when compiled with -Os, I got

[hjl@gnu-tools-1 build-x86_64-linux]$ cat math/test-double.out
testing double (without inline functions)
Failure: fma (-0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma (-0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma (0x1.deadbeef2feedp+900, 0x3.7ab6fbbcbfbb4p-1024,
-0x6.817e300692fecp-124): Exception "Inexact" set
Failure: fma (0x1.fffp+0, 0x1.0000000000001p+0, -0x1.fffp+0): Exception
"Inexact" set
Failure: fma (0xe.f56df7797f768p+1020, 0x3.7ab6fbbcbfbb4p-1024,
-0x3.40bf1803497f6p+0): Exception "Inexact" set
Failure: fma (0xf.ffffffffffff8p+1020, 0x1.001p+0, -0xf.ffffffffffff8p+1020):
Exception "Inexact" set
Failure: fma (0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma (0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_downward (-0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_downward (-0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_downward (0x1.deadbeef2feedp+900, 0x3.7ab6fbbcbfbb4p-1024,
-0x6.817e300692fecp-124): Exception "Inexact" set
Failure: fma_downward (0x1.fffp+0, 0x1.0000000000001p+0, -0x1.fffp+0):
Exception "Inexact" set
Failure: fma_downward (0xe.f56df7797f768p+1020, 0x3.7ab6fbbcbfbb4p-1024,
-0x3.40bf1803497f6p+0): Exception "Inexact" set
Failure: fma_downward (0xf.ffffffffffff8p+1020, 0x1.001p+0,
-0xf.ffffffffffff8p+1020): Exception "Inexact" set
Failure: fma_downward (0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_downward (0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_towardzero (-0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_towardzero (-0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_towardzero (0x1.deadbeef2feedp+900, 0x3.7ab6fbbcbfbb4p-1024,
-0x6.817e300692fecp-124): Exception "Inexact" set
Failure: fma_towardzero (0x1.fffp+0, 0x1.0000000000001p+0, -0x1.fffp+0):
Exception "Inexact" set
Failure: fma_towardzero (0xe.f56df7797f768p+1020, 0x3.7ab6fbbcbfbb4p-1024,
-0x3.40bf1803497f6p+0): Exception "Inexact" set
Failure: fma_towardzero (0xf.ffffffffffff8p+1020, 0x1.001p+0,
-0xf.ffffffffffff8p+1020): Exception "Inexact" set
Failure: fma_towardzero (0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_towardzero (0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_upward (-0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_upward (-0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_upward (0x1.deadbeef2feedp+900, 0x3.7ab6fbbcbfbb4p-1024,
-0x6.817e300692fecp-124): Exception "Inexact" set
Failure: fma_upward (0x1.fffp+0, 0x1.0000000000001p+0, -0x1.fffp+0): Exception
"Inexact" set
Failure: fma_upward (0xe.f56df7797f768p+1020, 0x3.7ab6fbbcbfbb4p-1024,
-0x3.40bf1803497f6p+0): Exception "Inexact" set
Failure: fma_upward (0xf.ffffffffffff8p+1020, 0x1.001p+0,
-0xf.ffffffffffff8p+1020): Exception "Inexact" set
Failure: fma_upward (0xf.ffffffffffff8p-4, -0xf.ffffffffffff8p-4,
0xf.ffffffffffffp-4): Exception "Inexact" set
Failure: fma_upward (0xf.ffffffffffff8p-4, 0xf.ffffffffffff8p-4,
-0xf.ffffffffffffp-4): Exception "Inexact" set

Test suite completed:
  87838 test cases plus 79930 tests for exception flags and
    79930 tests for errno executed.
  32 errors occurred.
[hjl@gnu-tools-1 build-x86_64-linux]$

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