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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82398 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-09-20 17:37:38 +00:00
parent 7453f8a68f
commit c1491f3c47
1 changed files with 15 additions and 36 deletions
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51
lib/Target/README.txt
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@@ -337,24 +337,22 @@ void foo(int N) {
for (i = 0; i < N; i++) { X = i; Y = i*4; } for (i = 0; i < N; i++) { X = i; Y = i*4; }
} }
produces two identical IV's (after promotion) on PPC/ARM: produces two near identical IV's (after promotion) on PPC/ARM:
LBB1_1: @bb.preheader LBB1_2:
mov r3, #0 ldr r3, LCPI1_0
mov r2, r3 ldr r3, [r3]
mov r1, r3 strh r2, [r3]
LBB1_2: @bb ldr r3, LCPI1_1
ldr r12, LCPI1_0 ldr r3, [r3]
ldr r12, [r12] strh r1, [r3]
strh r2, [r12] add r1, r1, #4
ldr r12, LCPI1_1 add r2, r2, #1 <- [0,+,1]
ldr r12, [r12] sub r0, r0, #1 <- [0,-,1]
strh r3, [r12] cmp r0, #0
add r1, r1, #1 <- [0,+,1] bne LBB1_2
add r3, r3, #4
add r2, r2, #1 <- [0,+,1] LSR should reuse the "+" IV for the exit test.
cmp r1, r0
bne LBB1_2 @bb
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
@@ -588,25 +586,6 @@ implementations of ceil/floor/rint.
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
This GCC bug: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34043
contains a testcase that compiles down to:
%struct.XMM128 = type { <4 x float> }
..
%src = alloca %struct.XMM128
..
%tmp6263 = bitcast %struct.XMM128* %src to <2 x i64>*
%tmp65 = getelementptr %struct.XMM128* %src, i32 0, i32 0
store <2 x i64> %tmp5899, <2 x i64>* %tmp6263, align 16
%tmp66 = load <4 x float>* %tmp65, align 16
%tmp71 = add <4 x float> %tmp66, %tmp66
If the mid-level optimizer turned the bitcast of pointer + store of tmp5899
into a bitcast of the vector value and a store to the pointer, then the
store->load could be easily removed.
//===---------------------------------------------------------------------===//
Consider: Consider:
int test() { int test() {