ce52b80744
This patch causes compile times for some patterns to explode. I have a (large, unreduced) test case that slows down by more than 20x and several test cases slow down by 2x. I'm sending some of the test cases directly to Nirav and following up with more details in the review log, but this should unblock anyone else hitting this. llvm-svn: 296862
63 lines
1.7 KiB
LLVM
63 lines
1.7 KiB
LLVM
; Check that unaligned accesses are allowed in general. We check the
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; few exceptions (like CRL) in their respective test files.
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;
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; FIXME: -combiner-alias-analysis (the default for SystemZ) stops
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; f1 from being optimized.
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; RUN: llc < %s -mtriple=s390x-linux-gnu -combiner-alias-analysis=false \
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; RUN: | FileCheck %s
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; Check that these four byte stores become a single word store.
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define void @f1(i8 *%ptr) {
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; CHECK: f1
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; CHECK: iilf [[REG:%r[0-5]]], 66051
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; CHECK: st [[REG]], 0(%r2)
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; CHECK: br %r14
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%off1 = getelementptr i8, i8 *%ptr, i64 1
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%off2 = getelementptr i8, i8 *%ptr, i64 2
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%off3 = getelementptr i8, i8 *%ptr, i64 3
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store i8 0, i8 *%ptr
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store i8 1, i8 *%off1
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store i8 2, i8 *%off2
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store i8 3, i8 *%off3
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ret void
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}
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; Check that unaligned 2-byte accesses are allowed.
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define i16 @f2(i16 *%src, i16 *%dst) {
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; CHECK-LABEL: f2:
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; CHECK: lh %r2, 0(%r2)
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; CHECK: sth %r2, 0(%r3)
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; CHECK: br %r14
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%val = load i16 , i16 *%src, align 1
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store i16 %val, i16 *%dst, align 1
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ret i16 %val
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}
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; Check that unaligned 4-byte accesses are allowed.
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define i32 @f3(i32 *%src1, i32 *%src2, i32 *%dst) {
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; CHECK-LABEL: f3:
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; CHECK: l %r2, 0(%r2)
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; CHECK: s %r2, 0(%r3)
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; CHECK: st %r2, 0(%r4)
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; CHECK: br %r14
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%val1 = load i32 , i32 *%src1, align 1
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%val2 = load i32 , i32 *%src2, align 2
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%sub = sub i32 %val1, %val2
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store i32 %sub, i32 *%dst, align 1
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ret i32 %sub
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}
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; Check that unaligned 8-byte accesses are allowed.
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define i64 @f4(i64 *%src1, i64 *%src2, i64 *%dst) {
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; CHECK-LABEL: f4:
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; CHECK: lg %r2, 0(%r2)
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; CHECK: sg %r2, 0(%r3)
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; CHECK: stg %r2, 0(%r4)
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; CHECK: br %r14
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%val1 = load i64 , i64 *%src1, align 1
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%val2 = load i64 , i64 *%src2, align 2
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%sub = sub i64 %val1, %val2
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store i64 %sub, i64 *%dst, align 4
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ret i64 %sub
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}
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