[Bug target/9760] [arm] Combine cannot do its job because immediate operand is used instead of register

["dhazeghi@yahoo.com" <gcc-bugzilla@gcc.gnu.org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9760



------- Additional Comments From dhazeghi@yahoo.com  2003-05-26 19:49 -------
Hello,

with gcc 3.3 I get the following code:

        .file   "01.i"
        .text
        .align  2
        .global func
        .type   func, %function
func:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 0, uses_anonymous_args = 0
        @ link register save eliminated.
        @ lr needed for prologue
        mov     pc, lr
        .size   func, .-func
        .align  2
        .global foo
        .type   foo, %function
foo:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 1, uses_anonymous_args = 0
        mov     ip, sp
        stmfd   sp!, {r4, fp, ip, lr, pc}
        mov     r1, r0, lsr #24
        sub     fp, ip, #4
        mov     r4, r0
        mov     r0, #8
        bl      func
        mov     r1, r4, asr #16
        and     r1, r1, #255
        mov     r0, #8
        bl      func
        mov     r4, r4, asr #8
        and     r4, r4, #255
        mov     r1, r4
        mov     r0, #8
        ldmea   fp, {r4, fp, sp, lr}
        b       func
        .size   foo, .-foo
        .ident  "GCC: (GNU) 3.3 20030508 (prerelease)"

with mainline, I get this slightly different code:

        .file   "01.i"
        .text
        .align  2
        .global func
        .type   func, %function
func:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 0, uses_anonymous_args = 0
        @ link register save eliminated.
        @ lr needed for prologue
        mov     pc, lr
        .size   func, .-func
        .align  2
        .global foo
        .type   foo, %function
foo:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 1, uses_anonymous_args = 0
        mov     ip, sp
        stmfd   sp!, {r4, fp, ip, lr, pc}
        mov     r1, r0, lsr #24
        sub     fp, ip, #4
        mov     r4, r0
        mov     r0, #8
        bl      func
        mov     r1, r4, lsr #16
        and     r1, r1, #255
        mov     r0, #8
        bl      func
        mov     r4, r4, lsr #8
        and     r1, r4, #255
        mov     r0, #8
        ldmea   fp, {r4, fp, sp, lr}
        b       func
        .size   foo, .-foo
        .ident  "GCC: (GNU) 3.4 20030508 (experimental)"

Is this an improvement from the code you saw (sorry, I don't know arm asm, and there are too 
many changes from the .s file you provided just to do a diff)? Thanks,

Dara



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