mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-19 01:13:25 +00:00
f5a309e989
trip count value when the original loop iteration condition is signed and the canonical induction variable won't undergo signed overflow. This isn't required for correctness; it just preserves more information about original loop iteration values. Add a getTruncateOrSignExtend method to ScalarEvolution, following getTruncateOrZeroExtend. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64918 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.2 KiB
LLVM
40 lines
1.2 KiB
LLVM
; RUN: llvm-as < %s | opt -indvars | llvm-dis > %t
|
|
; RUN: grep sext %t | count 2
|
|
; RUN: grep { = sext i32 %n to i64} %t
|
|
; RUN: grep phi %t | count 1
|
|
; RUN: grep {phi i64} %t
|
|
|
|
; Indvars should insert a 64-bit induction variable to eliminate the
|
|
; sext for the addressing, however it shouldn't eliminate the sext
|
|
; on the other phi, since that value undergoes signed wrapping.
|
|
|
|
define void @foo(i32* nocapture %d, i32 %n) nounwind {
|
|
entry:
|
|
%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
|
|
br i1 %0, label %bb.nph, label %return
|
|
|
|
bb.nph: ; preds = %entry
|
|
br label %bb
|
|
|
|
bb: ; preds = %bb1, %bb.nph
|
|
%i.02 = phi i32 [ %5, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=2]
|
|
%p.01 = phi i8 [ %4, %bb1 ], [ -1, %bb.nph ] ; <i8> [#uses=2]
|
|
%1 = sext i8 %p.01 to i32 ; <i32> [#uses=1]
|
|
%2 = sext i32 %i.02 to i64 ; <i64> [#uses=1]
|
|
%3 = getelementptr i32* %d, i64 %2 ; <i32*> [#uses=1]
|
|
store i32 %1, i32* %3, align 4
|
|
%4 = add i8 %p.01, 1 ; <i8> [#uses=1]
|
|
%5 = add i32 %i.02, 1 ; <i32> [#uses=2]
|
|
br label %bb1
|
|
|
|
bb1: ; preds = %bb
|
|
%6 = icmp slt i32 %5, %n ; <i1> [#uses=1]
|
|
br i1 %6, label %bb, label %bb1.return_crit_edge
|
|
|
|
bb1.return_crit_edge: ; preds = %bb1
|
|
br label %return
|
|
|
|
return: ; preds = %bb1.return_crit_edge, %entry
|
|
ret void
|
|
}
|