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commit e64235ff4266e87b20505101877fe57350ab69ab
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Author: Paul A. Clarke <pc@us.ibm.com>
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Date: Tue Sep 14 13:13:33 2021 -0500
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powerpc: Fix unrecognized instruction errors with recent GCC
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Recent binutils commit b25f942e18d6ecd7ec3e2d2e9930eb4f996c258a
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changes the behavior of `.machine` directives to override, rather
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than augment, the base CPU. This can result in _reduced_ functionality
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when, for example, compiling for default machine "power8", but explicitly
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asking for ".machine power5", which loses Altivec instructions.
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In tst-ucontext-ppc64-vscr.c, while the instructions provoking the new
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error messages are bracketed by ".machine power5", which is ostensibly
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Power ISA 2.03 (POWER5), the POWER5 processor did not support the
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VSX subset, so these instructions are not recognized as "power5".
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Error: unrecognized opcode: `vspltisb'
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Error: unrecognized opcode: `vpkuwus'
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Error: unrecognized opcode: `mfvscr'
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Error: unrecognized opcode: `stvx'
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Manually adding the VSX subset via ".machine altivec" is sufficient.
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Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
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(cherry picked from commit 064b475a2e5662b6b3973fabf505eade86e61510)
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diff --git a/sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c b/sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c
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index 28c87fcef72bded6..d3fc4ab589f4752a 100644
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--- a/sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c
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+++ b/sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c
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@@ -50,6 +50,7 @@ do_test (void)
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/* Set SAT bit in VSCR register. */
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asm volatile (".machine push;\n"
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".machine \"power5\";\n"
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+ ".machine altivec;\n"
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"vspltisb %0,0;\n"
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"vspltisb %1,-1;\n"
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"vpkuwus %0,%0,%1;\n"
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