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-/*
-Date: Tue, 21 Apr 87 09:58:10 PDT
-From: aks@acc-sb-unix.arpa (Alan Stebbens)
-To: bug-gcc@PREP.AI.MIT.EDU
-Subject: Optimizer doesn't.
-
-Dear GCC guys:
-
-The following simple C program illustrates a problem with the
-current version of GCC. What happens is that D3 is used doubly:
-once for loop limit testing, and once for long constant stores.
-Also, a loop limit test is being performed for the first iteration
-even when both the initial value and the ending values are known
-constants. Most optimizers can avoid the initial test if these
-values are known.
-
-Thanks for your time.
-
-Alan Stebbens (aks@acc-sb-unix.ARPA)
-
-==================== tst1.c ====================
-*/
-int array[100];
-int darray[10][10];
-
-main()
-{
- register int i, j;
- for (i = 0; i < 100; i++) array[i] = 3;
- for (i = 0; i < 10; i++)
- for (j = 0; j < 10; j++)
- darray[i][j] = 3;
- return 0;
-}
-
-/*
-==================== tst1.s ====================
-.comm _array,400
-.comm _darray,400
-.globl _main
-.text
- .even
-_main:
- link a6,#0
- moveml #0x3030,sp@-
- clrl d2
- lea _array,a0
- moveq #100,d3 <------ D3 now has limit of the test
- cmpl d2,d3
- jle L19
-L2:
- moveq #3,d3 <----- D3 is being reused!!
- movl d3,a0@(d2:l:4)
- addql #1,d2
- moveq #100,d3 <----- D3 is being reloaded!
- cmpl d2,d3
- jgt L2
-L19:
- clrl d2
- lea _darray,a2
- moveq #10,d3
- cmpl d2,d3
- jle L18
-L7:
- clrl d1
- movl d2,d0
- asll #5,d0
- movl d0,a3
- lea a3@(d2:l:8),a1
- moveq #10,d3
- cmpl d1,d3
- jle L17
-L10:
- lea a1@(d1:l:4),a0
- moveq #3,d3
- movl d3,a2@(a0:l)
- addql #1,d1
- moveq #10,d3
- cmpl d1,d3
- jgt L10
-L17:
- addql #1,d2
- moveq #10,d3
- cmpl d2,d3
- jgt L7
-L18:
- moveml a6@(-16),#0xc0c
- unlk a6
- rts
-
-Alan Stebbens (aks@acc-sb-unix.ARPA)
-*/