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123 lines
1.7 KiB
C
123 lines
1.7 KiB
C
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/* #1652 - Regression in code optimization */
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#include <stdlib.h>
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/* better before pr#1231
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before:
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jsr pusha
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ldy #$01
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ldx #$00
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lda (sp),y
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beq L0005
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lda (sp,x)
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beq L0005
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txa
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jmp incsp2 ; <--
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L0005: tya
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jmp incsp2
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after:
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jsr pusha
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ldy #$01
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ldx #$00
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lda (sp),y
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beq L0004
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lda (sp,x)
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beq L0004
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txa
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jmp L0001 ; <--
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L0004: tya
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L0001: jmp incsp2
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*/
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int foo(unsigned char bar, unsigned char baz)
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{
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return (bar == 0 || baz == 0);
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}
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/* worse before pr#1231
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before:
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;
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; y = 1;
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;
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lda #$01
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sta _y
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;
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; (*tablePtr)[y][x] = 83;
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;
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ldx #$00
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lda _y
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jsr aslax2
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clc
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adc _tablePtr
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pha
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txa
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adc _tablePtr+1
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tax
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pla
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clc
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adc _x
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bcc L0019
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inx
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L0019:
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sta ptr1
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stx ptr1+1
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lda #$53
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ldy #$00
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sta (ptr1),y
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after:
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;
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; y = 1;
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;
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lda #$01
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sta _y
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;
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; (*tablePtr)[y][x] = 83;
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;
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ldx #$00
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lda _y
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jsr aslax2
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clc
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adc _tablePtr
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sta ptr1
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txa
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adc _tablePtr+1
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sta ptr1+1
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ldy _x
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lda #$53
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sta (ptr1),y
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*/
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typedef unsigned char array_t[4][4];
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static array_t table = {
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{12, 13, 14, 15},
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{ 8, 9, 10, 11},
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{ 4, 5, 6, 7},
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{ 0, 1, 2, 3}
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};
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static array_t *tablePtr = &table;
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static unsigned char y = 0, x;
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void pointed_array(void)
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{
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x = 3;
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y = 1;
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(*tablePtr)[y][x] = 83;
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}
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int main(void)
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{
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pointed_array();
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return foo(2, 0) ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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