diff options
| author | Xi Ruoyao <xry111@xry111.site> | 2022-07-08 21:09:25 +0800 |
|---|---|---|
| committer | Xi Ruoyao <xry111@xry111.site> | 2022-07-10 11:39:45 +0800 |
| commit | b568e0db565b189eb434dbd44791aa816d71e72f (patch) | |
| tree | 41544368573e04935afae36fdd6a58d5243c7a2f | |
| parent | 7282722666c2bc43a4f10dcb88b100f8fe4d7bcc (diff) | |
loongarch: fix mulsidi3_64bit instruction
(mult (sign_extend:DI rj:SI) (sign_extend:DI rk:SI)) should be
"mulw.d.w", not "mul.d".
gcc/ChangeLog:
* config/loongarch/loongarch.md (mulsidi3_64bit): Use mulw.d.w
instead of mul.d.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/mulw_d_w.c: New test.
* gcc.c-torture/execute/mul-sext.c: New test.
(cherry picked from commit 1fa42d62140b56589771eb3d46f89c810bfc8e0a)
| -rw-r--r-- | gcc/config/loongarch/loongarch.md | 2 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/mul-sext.c | 20 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/loongarch/mulw_d_w.c | 10 |
3 files changed, 31 insertions, 1 deletions
diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md index d3c809e25f3..8f8412fba84 100644 --- a/gcc/config/loongarch/loongarch.md +++ b/gcc/config/loongarch/loongarch.md @@ -621,7 +621,7 @@ (mult:DI (sign_extend:DI (match_operand:SI 1 "register_operand" "r")) (sign_extend:DI (match_operand:SI 2 "register_operand" "r"))))] "TARGET_64BIT" - "mul.d\t%0,%1,%2" + "mulw.d.w\t%0,%1,%2" [(set_attr "type" "imul") (set_attr "mode" "DI")]) diff --git a/gcc/testsuite/gcc.c-torture/execute/mul-sext.c b/gcc/testsuite/gcc.c-torture/execute/mul-sext.c new file mode 100644 index 00000000000..8b6800804fb --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/mul-sext.c @@ -0,0 +1,20 @@ +/* { dg-do run } */ + +typedef __INT64_TYPE__ int64_t; +typedef __INT32_TYPE__ int32_t; + +/* f() was misoptimized to a single "mul.d" instruction on LA64. */ +__attribute__((noipa, noinline)) int64_t +f(int64_t a, int64_t b) +{ + return (int64_t)(int32_t)a * (int64_t)(int32_t)b; +} + +int +main() +{ + int64_t a = 0x1145140000000001; + int64_t b = 0x1919810000000001; + if (f(a, b) != 1) + __builtin_abort(); +} diff --git a/gcc/testsuite/gcc.target/loongarch/mulw_d_w.c b/gcc/testsuite/gcc.target/loongarch/mulw_d_w.c new file mode 100644 index 00000000000..4ab7df8836b --- /dev/null +++ b/gcc/testsuite/gcc.target/loongarch/mulw_d_w.c @@ -0,0 +1,10 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -mabi=lp64d" } */ +/* { dg-final { scan-assembler "mulw.d.w" } } */ + +/* This should be optimized to mulw.d.w for LA64. */ +__attribute__((noipa, noinline)) long +f(long a, long b) +{ + return (long)(int)a * (long)(int)b; +} |