From 5c0092070253113cf0d9c45eacc884b3ecc34d81 Mon Sep 17 00:00:00 2001 From: jsm28 Date: Sat, 25 Oct 2014 00:23:17 +0000 Subject: [PATCH] Only allow e500 double in SPE_SIMD_REGNO_P registers. rs6000_hard_regno_nregs_internal allows SPE vectors in single registers satisfying SPE_SIMD_REGNO_P (i.e. register numbers 0 to 31). However, the corresponding test for e500 double treats all registers as being able to store a 64-bit value, rather than just those GPRs. Logically this inconsistency is wrong; in addition, it causes problems unwinding from signal handlers. linux-unwind.h uses ARG_POINTER_REGNUM as a place to store the return address from a signal handler, but this logic in rs6000_hard_regno_nregs_internal results in that being considered an 8-byte register, resulting in assertion failures. ( first needs to be applied for unwinding to work in general on e500.) This patch makes rs6000_hard_regno_nregs_internal handle the e500 double case consistently with SPE vectors. Tested with no regressions with cross to powerpc-linux-gnuspe (given the aforementioned patch applied). Failures of signal handling unwinding tests such as gcc.dg/cleanup-{8,9,10,11}.c are fixed by this patch. * config/rs6000/rs6000.c (rs6000_hard_regno_nregs_internal): Do not allow e500 double in registers not satisyfing SPE_SIMD_REGNO_P. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@216688 138bc75d-0d04-0410-961f-82ee72b054a4 Signed-off-by: Khem Raj Upstream-Status: Backport [gcc 5.0] --- gcc/ChangeLog | 6 ++++++ gcc/config/rs6000/rs6000.c | 2 +- 2 files changed, 7 insertions(+), 1 deletion(-) Index: gcc-4.9.2/gcc/config/rs6000/rs6000.c =================================================================== --- gcc-4.9.2.orig/gcc/config/rs6000/rs6000.c +++ gcc-4.9.2/gcc/config/rs6000/rs6000.c @@ -1703,7 +1703,7 @@ rs6000_hard_regno_nregs_internal (int re SCmode so as to pass the value correctly in a pair of registers. */ else if (TARGET_E500_DOUBLE && FLOAT_MODE_P (mode) && mode != SCmode - && !DECIMAL_FLOAT_MODE_P (mode)) + && !DECIMAL_FLOAT_MODE_P (mode) && SPE_SIMD_REGNO_P (regno)) reg_size = UNITS_PER_FP_WORD; else