https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87511
Bug ID: 87511
Summary: [9 Regression][AArch64] UBFIZ instruction with invalid
immediate emitted
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sudi at gcc dot gnu.org
Target Milestone: ---
When compiling the code below with aarch64 and -Os
int a, d;
struct {
signed f5 : 26;
signed f6 : 12;
} b;
signed char c;
void fn1() {
signed char *e = &c;
d = a * 10;
*e = d;
b.f6 = c;
b.f5 = 8 <= 3;
}
We get:
$ aarch64-none-elf-gcc -march=armv8-a -c test.c -o /dev/null -Os -Wall
/tmp/ccVimNZB.s: Assembler messages:
/tmp/ccVimNZB.s:20: Error: immediate value out of range 1 to 32 at operand 4 --
`ubfiz x0,x0,32,38'
This started somewhere between r260322 and r261702.
Seems to be incorrectly matching the below in IRA
//(insn:TI 30 22 35 (set (reg:DI 0 x0 [120])
// (and:DI (ashift:DI (reg:DI 0 x0 [orig:92 _3 ] [92])
// (const_int 32 [0x20]))
// (const_int 17587958185983 [0xfff03ffffff]))) "bfiz.c":12 786
\{*andim_ashiftdi_bfiz}
// (nil))
ubfiz x0, x0, 32, 38 // 30 [c=4 l=4] *andim_ashiftdi_bfiz
