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https://github.com/crosstool-ng/crosstool-ng.git
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1906cf93f8
You might just say: 'Yeah! crosstool-NG's got its own repo!". Unfortunately, that's because the previous repo got damaged beyond repair and I had no backup. That means I'm putting backups in place in the afternoon. That also means we've lost history... :-(
146 lines
4.0 KiB
Diff
146 lines
4.0 KiB
Diff
[lightly edited to fit my patch directory - dank]
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From: kaz Kojima <kkojima@rr.iij4u.or.jp>
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Date: Sat, 09 Aug 2003 09:46:21 +0900
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To: dank@kegel.com
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Hi Dan,
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I've come back from the vacation and looked glibc string test
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failures on sh4. This looks a gcc problem. gcc-3.3/3.4 doesn't
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compile these tests correctly. The attached testcase aborts on
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gcc-3.3/3.4 -O2 but exits normally gcc-3.2 and gcc-3.0.
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The option -O2 is not essential but it makes the testcase small.
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The failed string tests include the same pattern of the code with
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f=random to generate ramdom strings but they get strings with
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embedded NULL characters :-(
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...
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I've got a workaround below for this bug, though it might merely
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paper over the real bug. Anyway, I'd like to send a PR for this.
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Regards,
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kaz
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--
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int val = 0xff00;
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int f (void) { return val; }
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unsigned char a[1];
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void
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foo (void)
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{
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a[0] = f () & 255;
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if (!a[0])
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a[0] = f () & 255;
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if (!a[0])
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a[0] = 1 + (f () & 127);
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}
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int
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main (int argc, char **argv)
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{
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foo ();
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if (!a[0])
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abort ();
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return 0;
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}
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--
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diff -u3prN ORIG/gcc/gcc/config/sh/sh.c LOCAL/gcc/gcc/config/sh/sh.c
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--- gcc/gcc/config/sh/sh.c.old Fri Aug 8 18:39:02 2003
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+++ gcc/gcc/config/sh/sh.c Fri Aug 8 22:31:02 2003
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@@ -6657,6 +6657,19 @@ arith_reg_dest (op, mode)
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return arith_reg_operand (op, mode);
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}
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+/* Like above, but for SImode compare destinations: forbid paradoxical
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+ subregs, because it would get the combiner confused. */
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+int
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+arith_reg_cmp_dest (op, mode)
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+ rtx op;
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+ enum machine_mode mode;
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+{
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+ if (mode == SImode && GET_CODE (op) == SUBREG
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+ && GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))) < 4)
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+ return 0;
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+ return arith_reg_operand (op, mode);
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+}
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+
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int
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int_gpr_dest (op, mode)
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rtx op;
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diff -u3prN ORIG/gcc/gcc/config/sh/sh.h LOCAL/gcc/gcc/config/sh/sh.h
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--- gcc/gcc/config/sh/sh.h.old Fri Aug 8 18:39:02 2003
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+++ gcc/gcc/config/sh/sh.h Fri Aug 8 22:31:02 2003
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@@ -3365,6 +3365,7 @@ extern int rtx_equal_function_value_matt
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{"and_operand", {SUBREG, REG, CONST_INT}}, \
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{"any_register_operand", {SUBREG, REG}}, \
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{"arith_operand", {SUBREG, REG, CONST_INT}}, \
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+ {"arith_reg_cmp_dest", {SUBREG, REG}}, \
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{"arith_reg_dest", {SUBREG, REG}}, \
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{"arith_reg_operand", {SUBREG, REG}}, \
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{"arith_reg_or_0_operand", {SUBREG, REG, CONST_INT, CONST_VECTOR}}, \
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--- gcc-3.3/gcc/config/sh/sh.md.orig Tue Apr 15 10:06:10 2003
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+++ gcc-3.3/gcc/config/sh/sh.md Sat Aug 9 22:31:13 2003
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@@ -616,7 +616,7 @@
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(define_insn ""
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[(set (reg:SI T_REG)
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- (eq:SI (and:SI (match_operand:SI 0 "arith_reg_operand" "z,r")
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+ (eq:SI (and:SI (match_operand:SI 0 "arith_reg_cmp_dest" "z,r")
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(match_operand:SI 1 "arith_operand" "L,r"))
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(const_int 0)))]
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"TARGET_SH1"
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@@ -631,7 +631,7 @@
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(define_insn "cmpeqsi_t"
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[(set (reg:SI T_REG)
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- (eq:SI (match_operand:SI 0 "arith_reg_operand" "r,z,r")
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+ (eq:SI (match_operand:SI 0 "arith_reg_cmp_dest" "r,z,r")
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(match_operand:SI 1 "arith_operand" "N,rI,r")))]
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"TARGET_SH1"
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"@
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@@ -642,7 +642,7 @@
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(define_insn "cmpgtsi_t"
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[(set (reg:SI T_REG)
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- (gt:SI (match_operand:SI 0 "arith_reg_operand" "r,r")
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+ (gt:SI (match_operand:SI 0 "arith_reg_cmp_dest" "r,r")
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(match_operand:SI 1 "arith_reg_or_0_operand" "r,N")))]
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"TARGET_SH1"
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"@
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@@ -652,7 +652,7 @@
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(define_insn "cmpgesi_t"
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[(set (reg:SI T_REG)
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- (ge:SI (match_operand:SI 0 "arith_reg_operand" "r,r")
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+ (ge:SI (match_operand:SI 0 "arith_reg_cmp_dest" "r,r")
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(match_operand:SI 1 "arith_reg_or_0_operand" "r,N")))]
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"TARGET_SH1"
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"@
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@@ -666,7 +666,7 @@
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(define_insn "cmpgeusi_t"
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[(set (reg:SI T_REG)
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- (geu:SI (match_operand:SI 0 "arith_reg_operand" "r")
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+ (geu:SI (match_operand:SI 0 "arith_reg_cmp_dest" "r")
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(match_operand:SI 1 "arith_reg_operand" "r")))]
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"TARGET_SH1"
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"cmp/hs %1,%0"
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@@ -674,7 +674,7 @@
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(define_insn "cmpgtusi_t"
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[(set (reg:SI T_REG)
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- (gtu:SI (match_operand:SI 0 "arith_reg_operand" "r")
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+ (gtu:SI (match_operand:SI 0 "arith_reg_cmp_dest" "r")
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(match_operand:SI 1 "arith_reg_operand" "r")))]
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"TARGET_SH1"
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"cmp/hi %1,%0"
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