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28e104bcb0
These tests all follow the same pattern: mov r2, r0 movs r0, #0 $CMP r2, r1 it eq moveq r0, #1 bx lr The first 'mov' can be eliminated by rematerializing 'movs r0, #0' below the test instruction: $CMP r0, r1 mov.w r0, #0 it eq moveq r0, #1 bx lr So far, only physreg coalescing can do that. The register allocators won't yet split live ranges just to eliminate copies. They can learn, but this particular problem is not likely to show up in real code. It only appears because r0 is used for both the function argument and return value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130858 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.1 KiB
LLVM
53 lines
1.1 KiB
LLVM
; RUN: llc < %s -march=thumb -mattr=+thumb2 -join-physregs | FileCheck %s
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; These tests implicitly depend on 'movs r0, #0' being rematerialized below the
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; test as 'mov.w r0, #0'. So far, that requires physreg joining.
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define i1 @f1(i32 %a, i32 %b) {
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; CHECK: f1:
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; CHECK: cmp r0, r1
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%tmp = icmp ne i32 %a, %b
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ret i1 %tmp
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}
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define i1 @f2(i32 %a, i32 %b) {
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; CHECK: f2:
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; CHECK: cmp r0, r1
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%tmp = icmp eq i32 %a, %b
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ret i1 %tmp
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}
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define i1 @f6(i32 %a, i32 %b) {
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; CHECK: f6:
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; CHECK: cmp.w r0, r1, lsl #5
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%tmp = shl i32 %b, 5
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%tmp1 = icmp eq i32 %tmp, %a
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ret i1 %tmp1
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}
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define i1 @f7(i32 %a, i32 %b) {
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; CHECK: f7:
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; CHECK: cmp.w r0, r1, lsr #6
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%tmp = lshr i32 %b, 6
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%tmp1 = icmp ne i32 %tmp, %a
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ret i1 %tmp1
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}
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define i1 @f8(i32 %a, i32 %b) {
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; CHECK: f8:
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; CHECK: cmp.w r0, r1, asr #7
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%tmp = ashr i32 %b, 7
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%tmp1 = icmp eq i32 %a, %tmp
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ret i1 %tmp1
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}
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define i1 @f9(i32 %a, i32 %b) {
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; CHECK: f9:
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; CHECK: cmp.w r0, r0, ror #8
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%l8 = shl i32 %a, 24
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%r8 = lshr i32 %a, 8
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%tmp = or i32 %l8, %r8
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%tmp1 = icmp ne i32 %a, %tmp
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ret i1 %tmp1
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}
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