diff options
Diffstat (limited to 'test/Transforms')
-rw-r--r-- | test/Transforms/LoopVectorize/reverse_induction.ll | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/test/Transforms/LoopVectorize/reverse_induction.ll b/test/Transforms/LoopVectorize/reverse_induction.ll index f43f02b..9e8c1b1 100644 --- a/test/Transforms/LoopVectorize/reverse_induction.ll +++ b/test/Transforms/LoopVectorize/reverse_induction.ll @@ -77,3 +77,72 @@ loopend: } +@a = common global [1024 x i32] zeroinitializer, align 16 + +; We incorrectly transformed this loop into an empty one because we left the +; induction variable in i8 type and truncated the exit value 1024 to 0. +; int a[1024]; +; +; void fail() { +; int reverse_induction = 1023; +; unsigned char forward_induction = 0; +; while ((reverse_induction) >= 0) { +; forward_induction++; +; a[reverse_induction] = forward_induction; +; --reverse_induction; +; } +; } + +; CHECK: reverse_forward_induction_i64_i8 +; CHECK: vector.body +; CHECK: %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ] +; CHECK: %normalized.idx = sub i64 %index, 0 +; CHECK: %reverse.idx = sub i64 1023, %normalized.idx +; CHECK: trunc i64 %index to i8 + +define void @reverse_forward_induction_i64_i8() { +entry: + br label %while.body + +while.body: + %indvars.iv = phi i64 [ 1023, %entry ], [ %indvars.iv.next, %while.body ] + %forward_induction.05 = phi i8 [ 0, %entry ], [ %inc, %while.body ] + %inc = add i8 %forward_induction.05, 1 + %conv = zext i8 %inc to i32 + %arrayidx = getelementptr inbounds [1024 x i32]* @a, i64 0, i64 %indvars.iv + store i32 %conv, i32* %arrayidx, align 4 + %indvars.iv.next = add i64 %indvars.iv, -1 + %0 = trunc i64 %indvars.iv to i32 + %cmp = icmp sgt i32 %0, 0 + br i1 %cmp, label %while.body, label %while.end + +while.end: + ret void +} + +; CHECK: reverse_forward_induction_i64_i8_signed +; CHECK: vector.body: +; CHECK: %index = phi i64 [ 129, %vector.ph ], [ %index.next, %vector.body ] +; CHECK: %normalized.idx = sub i64 %index, 129 +; CHECK: %reverse.idx = sub i64 1023, %normalized.idx +; CHECK: trunc i64 %index to i8 + +define void @reverse_forward_induction_i64_i8_signed() { +entry: + br label %while.body + +while.body: + %indvars.iv = phi i64 [ 1023, %entry ], [ %indvars.iv.next, %while.body ] + %forward_induction.05 = phi i8 [ -127, %entry ], [ %inc, %while.body ] + %inc = add i8 %forward_induction.05, 1 + %conv = sext i8 %inc to i32 + %arrayidx = getelementptr inbounds [1024 x i32]* @a, i64 0, i64 %indvars.iv + store i32 %conv, i32* %arrayidx, align 4 + %indvars.iv.next = add i64 %indvars.iv, -1 + %0 = trunc i64 %indvars.iv to i32 + %cmp = icmp sgt i32 %0, 0 + br i1 %cmp, label %while.body, label %while.end + +while.end: + ret void +} |