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Teach EmitLiveInCopies to omit copies for unused virtual registers,

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and to clean up unused incoming physregs from the live-in list.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106805 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-06-24 22:23:02 +00:00
parent f241b26792
commit fe5e4dabbf
3 changed files with 32 additions and 21 deletions
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8
test/CodeGen/ARM/long_shift.ll
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@@ -23,10 +23,10 @@ define i32 @f1(i64 %x, i64 %y) {
define i32 @f2(i64 %x, i64 %y) {
; CHECK: f2
; CHECK: mov r0, r0, lsr r2
; CHECK-NEXT: rsb r12, r2, #32
; CHECK-NEXT: rsb r3, r2, #32
; CHECK-NEXT: sub r2, r2, #32
; CHECK-NEXT: cmp r2, #0
; CHECK-NEXT: orr r0, r0, r1, lsl r12
; CHECK-NEXT: orr r0, r0, r1, lsl r3
; CHECK-NEXT: movge r0, r1, asr r2
%a = ashr i64 %x, %y
%b = trunc i64 %a to i32
@@ -36,10 +36,10 @@ define i32 @f2(i64 %x, i64 %y) {
define i32 @f3(i64 %x, i64 %y) {
; CHECK: f3
; CHECK: mov r0, r0, lsr r2
; CHECK-NEXT: rsb r12, r2, #32
; CHECK-NEXT: rsb r3, r2, #32
; CHECK-NEXT: sub r2, r2, #32
; CHECK-NEXT: cmp r2, #0
; CHECK-NEXT: orr r0, r0, r1, lsl r12
; CHECK-NEXT: orr r0, r0, r1, lsl r3
; CHECK-NEXT: movge r0, r1, lsr r2
%a = lshr i64 %x, %y
%b = trunc i64 %a to i32