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add a bad case evan though of. 

llvm-svn: 35296
This commit is contained in:
Chris Lattner 2007-03-24 06:01:32 +00:00
parent a962d18774
commit 43cab75914
1 changed files with 32 additions and 0 deletions
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32
llvm/lib/Target/README.txt
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@ -377,3 +377,35 @@ Promote for i32 bswap can use i64 bswap + shr. Useful on targets with 64-bit
regs and bswap, like itanium.
//===---------------------------------------------------------------------===//
LSR should know what GPR types a target has. This code:
volatile short X, Y; // globals
void foo(int N) {
int i;
for (i = 0; i < N; i++) { X = i; Y = i*4; }
}
produces two identical IV's (after promotion) on PPC/ARM:
LBB1_1: @bb.preheader
mov r3, #0
mov r2, r3
mov r1, r3
LBB1_2: @bb
ldr r12, LCPI1_0
ldr r12, [r12]
strh r2, [r12]
ldr r12, LCPI1_1
ldr r12, [r12]
strh r3, [r12]
add r1, r1, #1 <- [0,+,1]
add r3, r3, #4
add r2, r2, #1 <- [0,+,1]
cmp r1, r0
bne LBB1_2 @bb
//===---------------------------------------------------------------------===//