diff options
Diffstat (limited to 'recipes/gcc/gcc-4.2.4/ep93xx/arm-crunch-neg-protect.patch')
| -rw-r--r-- | recipes/gcc/gcc-4.2.4/ep93xx/arm-crunch-neg-protect.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/recipes/gcc/gcc-4.2.4/ep93xx/arm-crunch-neg-protect.patch b/recipes/gcc/gcc-4.2.4/ep93xx/arm-crunch-neg-protect.patch new file mode 100644 index 0000000000..a675d4b07a --- /dev/null +++ b/recipes/gcc/gcc-4.2.4/ep93xx/arm-crunch-neg-protect.patch @@ -0,0 +1,35 @@ +The Crunch cfnegs and cfnegd instructions have a hardware bug in all silicon +revisions (D0 to E2) whereby neg(0) returns 0 (not -0). See erratum 12. + +For ieee-correctness, and to pass another case in GCC's IEEE testsuite, +we disable the instruction and do it in software unless +-funsafe-math-optimizations (included in -ffast-math) is given. + + Martin Guy <martinwguy@yahoo.it>, September 2008 + +Index: gcc-4.2.4/gcc/config/arm/cirrus.md +=================================================================== +--- gcc-4.2.4.orig/gcc/config/arm/cirrus.md 2007-09-01 16:28:30.000000000 +0100 ++++ gcc-4.2.4/gcc/config/arm/cirrus.md 2009-08-09 15:45:13.000000000 +0100 +@@ -254,10 +254,11 @@ + [(set_attr "cirrus" "normal")] + ) + ++; Cirrus hardware bug: neg 0 -> 0 instead of -0 + (define_insn "*cirrus_negsf2" + [(set (match_operand:SF 0 "cirrus_fp_register" "=v") + (neg:SF (match_operand:SF 1 "cirrus_fp_register" "v")))] +- "TARGET_ARM && TARGET_HARD_FLOAT && TARGET_MAVERICK" ++ "TARGET_ARM && TARGET_HARD_FLOAT && TARGET_MAVERICK && ! HONOR_SIGNED_ZEROS (SFmode)" + "cfnegs%?\\t%V0, %V1" + [(set_attr "cirrus" "normal")] + ) +@@ -265,7 +266,7 @@ + (define_insn "*cirrus_negdf2" + [(set (match_operand:DF 0 "cirrus_fp_register" "=v") + (neg:DF (match_operand:DF 1 "cirrus_fp_register" "v")))] +- "TARGET_ARM && TARGET_HARD_FLOAT && TARGET_MAVERICK" ++ "TARGET_ARM && TARGET_HARD_FLOAT && TARGET_MAVERICK && ! HONOR_SIGNED_ZEROS (DFmode)" + "cfnegd%?\\t%V0, %V1" + [(set_attr "cirrus" "normal")] + ) |