diff options
| -rw-r--r-- | gcc/config/i386/i386.md | 27 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/divmod-9.c | 14 |
2 files changed, 40 insertions, 1 deletions
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index 26fb81b..8b809c4 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -8385,7 +8385,7 @@ (ashiftrt:SWIM248 (match_dup 4) (match_dup 5))) (clobber (reg:CC FLAGS_REG))]) (parallel [(set (match_dup 0) - (div:SWIM248 (match_dup 2) (match_dup 3))) + (div:SWIM248 (match_dup 2) (match_dup 3))) (set (match_dup 1) (mod:SWIM248 (match_dup 2) (match_dup 3))) (use (match_dup 1)) @@ -8661,6 +8661,31 @@ [(set_attr "type" "idiv") (set_attr "mode" "SI")]) +;; Avoid sign-extension (using cdq) for constant numerators. +(define_insn_and_split "*divmodsi4_const" + [(set (match_operand:SI 0 "register_operand" "=&a") + (div:SI (match_operand:SI 2 "const_int_operand" "n") + (match_operand:SI 3 "nonimmediate_operand" "rm"))) + (set (match_operand:SI 1 "register_operand" "=&d") + (mod:SI (match_dup 2) (match_dup 3))) + (clobber (reg:CC FLAGS_REG))] + "!optimize_function_for_size_p (cfun)" + "#" + "reload_completed" + [(set (match_dup 0) (match_dup 2)) + (set (match_dup 1) (match_dup 4)) + (parallel [(set (match_dup 0) + (div:SI (match_dup 0) (match_dup 3))) + (set (match_dup 1) + (mod:SI (match_dup 0) (match_dup 3))) + (use (match_dup 1)) + (clobber (reg:CC FLAGS_REG))])] +{ + operands[4] = INTVAL (operands[2]) < 0 ? constm1_rtx : const0_rtx; +} + [(set_attr "type" "multi") + (set_attr "mode" "SI")]) + (define_expand "divmodqi4" [(parallel [(set (match_operand:QI 0 "register_operand") (div:QI diff --git a/gcc/testsuite/gcc.target/i386/divmod-9.c b/gcc/testsuite/gcc.target/i386/divmod-9.c new file mode 100644 index 0000000..1515e69 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/divmod-9.c @@ -0,0 +1,14 @@ +/* { dg-do compile } */ +/* { dg-options "-O2" } */ + +int foo (int x) +{ + return 100/x; +} + +int bar(int x) +{ + return -100/x; +} +/* { dg-final { scan-assembler-not "(cltd|cdq)" } } */ + |