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We have to do this in DAGBuilder instead of DAGCombiner, because the exact bit is lost after building. struct foo { char x[24]; }; long bar(struct foo *a, struct foo *b) { return a-b; } is now compiled into movl 4(%esp), %eax subl 8(%esp), %eax sarl $3, %eax imull $-1431655765, %eax, %eax instead of movl 4(%esp), %eax subl 8(%esp), %eax movl $715827883, %ecx imull %ecx movl %edx, %eax shrl $31, %eax sarl $2, %edx addl %eax, %edx movl %edx, %eax git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134695 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
351 B
LLVM
19 lines
351 B
LLVM
; RUN: llc -march=x86 < %s | FileCheck %s
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define i32 @test1(i32 %x) {
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%div = sdiv exact i32 %x, 25
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ret i32 %div
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; CHECK: test1:
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; CHECK: imull $-1030792151, 4(%esp)
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; CHECK-NEXT: ret
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}
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define i32 @test2(i32 %x) {
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%div = sdiv exact i32 %x, 24
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ret i32 %div
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; CHECK: test2:
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; CHECK: sarl $3
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; CHECK-NEXT: imull $-1431655765
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; CHECK-NEXT: ret
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}
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