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| author | Mike Frysinger <vapier@gentoo.org> | 2021-11-11 19:30:41 -0500 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2021-11-13 00:57:00 -0500 |
| commit | dc5a4621600e650b89deb92c79eaacc73fcc767a (patch) | |
| tree | 751639d6cd55b404a0ec0ccc03411649abfa7eb2 /sim | |
| parent | b9252d079a28c6da1b42e501217f25e8a6652321 (diff) | |
| download | gdb-dc5a4621600e650b89deb92c79eaacc73fcc767a.zip gdb-dc5a4621600e650b89deb92c79eaacc73fcc767a.tar.gz gdb-dc5a4621600e650b89deb92c79eaacc73fcc767a.tar.bz2 | |
sim: sh: rework carry checks to not rely on integer overflows
In <=gcc-7 versions, -fstrict-overflow is enabled by default, and that
triggers warnings in this code that relies on integer overflows to test
for carries. Change the logic to test against the limit directly.
Diffstat (limited to 'sim')
| -rw-r--r-- | sim/sh/gencode.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sim/sh/gencode.c b/sim/sh/gencode.c index 80eecfd..5eb7caf 100644 --- a/sim/sh/gencode.c +++ b/sim/sh/gencode.c @@ -2266,7 +2266,7 @@ op ppi_tab[] = "int Sx_grd = GET_DSP_GRD (x);", "", "res = Sx - 0x10000;", - "carry = res > Sx;", + "carry = Sx < (INT_MIN + 0x10000);", "res_grd = Sx_grd - carry;", "COMPUTE_OVERFLOW;", "ADD_SUB_GE;", @@ -2277,7 +2277,7 @@ op ppi_tab[] = "int Sx_grd = GET_DSP_GRD (x);", "", "res = Sx + 0x10000;", - "carry = res < Sx;", + "carry = Sx > (INT_MAX - 0x10000);", "res_grd = Sx_grd + carry;", "COMPUTE_OVERFLOW;", "ADD_SUB_GE;", @@ -2288,7 +2288,7 @@ op ppi_tab[] = "int Sy_grd = SIGN32 (Sy);", "", "res = Sy - 0x10000;", - "carry = res > Sy;", + "carry = Sy < (INT_MIN + 0x10000);", "res_grd = Sy_grd - carry;", "COMPUTE_OVERFLOW;", "ADD_SUB_GE;", @@ -2299,7 +2299,7 @@ op ppi_tab[] = "int Sy_grd = SIGN32 (Sy);", "", "res = Sy + 0x10000;", - "carry = res < Sy;", + "carry = Sy > (INT_MAX - 0x10000);", "res_grd = Sy_grd + carry;", "COMPUTE_OVERFLOW;", "ADD_SUB_GE;", |