diff options
Diffstat (limited to 'gcc/config/arm/arm.c')
| -rw-r--r-- | gcc/config/arm/arm.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index d9763d23509..6e2b799fe57 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -3172,6 +3172,19 @@ arm_canonicalize_comparison (enum rtx_code code, rtx *op0, rtx *op1) return code; } + /* If *op0 is (zero_extend:SI (subreg:QI (reg:SI) 0)) and comparing + with const0_rtx, change it to (and:SI (reg:SI) (const_int 255)), + to facilitate possible combining with a cmp into 'ands'. */ + if (mode == SImode + && GET_CODE (*op0) == ZERO_EXTEND + && GET_CODE (XEXP (*op0, 0)) == SUBREG + && GET_MODE (XEXP (*op0, 0)) == QImode + && GET_MODE (SUBREG_REG (XEXP (*op0, 0))) == SImode + && subreg_lowpart_p (XEXP (*op0, 0)) + && *op1 == const0_rtx) + *op0 = gen_rtx_AND (SImode, SUBREG_REG (XEXP (*op0, 0)), + GEN_INT (255)); + /* Comparisons smaller than DImode. Only adjust comparisons against an out-of-range constant. */ if (GET_CODE (*op1) != CONST_INT @@ -16713,7 +16726,7 @@ arm_print_operand (FILE *stream, rtx x, int code) instruction (for some alignments) as an aid to the memory subsystem of the target. */ align = MEM_ALIGN (x) >> 3; - memsize = INTVAL (MEM_SIZE (x)); + memsize = MEM_SIZE (x); /* Only certain alignment specifiers are supported by the hardware. */ if (memsize == 16 && (align % 32) == 0) |