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| author | Xeonacid <h.dwwwwww@gmail.com> | 2025-04-04 13:35:06 +0200 |
|---|---|---|
| committer | Chris Packham <judge.packham@gmail.com> | 2025-04-22 09:57:25 +1200 |
| commit | 4e7bdd2b259eb95386ab5987d525f54470159e67 (patch) | |
| tree | 7767e8bccdbbc4ca99f2d807d9a3cbf1282c6ea0 /packages/gcc/9.5.0/0031-riscv-Make-__divdi3-handle-div-by-zero-same-as-hard.patch | |
| parent | b9348944c8b357e798989d9b224e869decd02919 (diff) | |
| download | crosstool-ng-4e7bdd2b259eb95386ab5987d525f54470159e67.tar.gz crosstool-ng-4e7bdd2b259eb95386ab5987d525f54470159e67.tar.bz2 crosstool-ng-4e7bdd2b259eb95386ab5987d525f54470159e67.zip | |
gcc/riscv: Fix incorrect jal with HIDDEN_JUMPTARGET
Similar to #2315, backport commit 45116f3 for gcc 7,8,9.
Gcc 7 is the first version to support RISC-V.
Signed-off-by: Xeonacid <h.dwwwwww@gmail.com>
Diffstat (limited to 'packages/gcc/9.5.0/0031-riscv-Make-__divdi3-handle-div-by-zero-same-as-hard.patch')
| -rw-r--r-- | packages/gcc/9.5.0/0031-riscv-Make-__divdi3-handle-div-by-zero-same-as-hard.patch | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/packages/gcc/9.5.0/0031-riscv-Make-__divdi3-handle-div-by-zero-same-as-hard.patch b/packages/gcc/9.5.0/0031-riscv-Make-__divdi3-handle-div-by-zero-same-as-hard.patch new file mode 100644 index 00000000..47c25104 --- /dev/null +++ b/packages/gcc/9.5.0/0031-riscv-Make-__divdi3-handle-div-by-zero-same-as-hard.patch @@ -0,0 +1,40 @@ +From 4013baf99c38f7bca06a51f8301e8fb195ccfa33 Mon Sep 17 00:00:00 2001 +From: Jim Wilson <jimw@sifive.com> +Date: Tue, 2 Jun 2020 11:19:39 -0700 +Subject: [PATCH] RISC-V: Make __divdi3 handle div by zero same as hardware. + +The ISA manual specifies that divide by zero always returns -1 as the result. +We were failing to do that when the dividend was negative. + +Original patch from Virginie Moser. + + libgcc/ + * config/riscv/div.S (__divdi3): For negative arguments, change bgez + to bgtz. +--- + libgcc/config/riscv/div.S | 8 +++++--- + 1 file changed, 5 insertions(+), 3 deletions(-) + +diff --git a/libgcc/config/riscv/div.S b/libgcc/config/riscv/div.S +index 151f8e273a..17234324c1 100644 +--- a/libgcc/config/riscv/div.S ++++ b/libgcc/config/riscv/div.S +@@ -107,10 +107,12 @@ FUNC_END (__umoddi3) + /* Handle negative arguments to __divdi3. */ + .L10: + neg a0, a0 +- bgez a1, .L12 /* Compute __udivdi3(-a0, a1), then negate the result. */ ++ /* Zero is handled as a negative so that the result will not be inverted. */ ++ bgtz a1, .L12 /* Compute __udivdi3(-a0, a1), then negate the result. */ ++ + neg a1, a1 +- j __udivdi3 /* Compute __udivdi3(-a0, -a1). */ +-.L11: /* Compute __udivdi3(a0, -a1), then negate the result. */ ++ j __udivdi3 /* Compute __udivdi3(-a0, -a1). */ ++.L11: /* Compute __udivdi3(a0, -a1), then negate the result. */ + neg a1, a1 + .L12: + move t0, ra +-- +2.49.0 + |