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authorStephen Hines <srhines@google.com>2015-04-01 18:49:24 +0000
committerGerrit Code Review <noreply-gerritcodereview@google.com>2015-04-01 18:49:26 +0000
commit3fa16bd6062e23bcdb82ed4dd965674792e6b761 (patch)
tree9348fc507292f7e8715d22d64ce5a32131b4f875 /test/Transforms/StraightLineStrengthReduce/slsr.ll
parentbeed47390a60f6f0c77532b3d3f76bb47ef49423 (diff)
parentebe69fe11e48d322045d5949c83283927a0d790b (diff)
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Merge "Update aosp/master LLVM for rebase to r230699."
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diff --git a/test/Transforms/StraightLineStrengthReduce/slsr.ll b/test/Transforms/StraightLineStrengthReduce/slsr.ll
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+; RUN: opt < %s -slsr -gvn -dce -S | FileCheck %s
+
+declare i32 @foo(i32 %a)
+
+define i32 @slsr1(i32 %b, i32 %s) {
+; CHECK-LABEL: @slsr1(
+ ; v0 = foo(b * s);
+ %mul0 = mul i32 %b, %s
+; CHECK: mul i32
+; CHECK-NOT: mul i32
+ %v0 = call i32 @foo(i32 %mul0)
+
+ ; v1 = foo((b + 1) * s);
+ %b1 = add i32 %b, 1
+ %mul1 = mul i32 %b1, %s
+ %v1 = call i32 @foo(i32 %mul1)
+
+ ; v2 = foo((b + 2) * s);
+ %b2 = add i32 %b, 2
+ %mul2 = mul i32 %b2, %s
+ %v2 = call i32 @foo(i32 %mul2)
+
+ ; return v0 + v1 + v2;
+ %1 = add i32 %v0, %v1
+ %2 = add i32 %1, %v2
+ ret i32 %2
+}
+
+; v0 = foo(a * b)
+; v1 = foo((a + 1) * b)
+; v2 = foo(a * (b + 1))
+; v3 = foo((a + 1) * (b + 1))
+define i32 @slsr2(i32 %a, i32 %b) {
+; CHECK-LABEL: @slsr2(
+ %a1 = add i32 %a, 1
+ %b1 = add i32 %b, 1
+ %mul0 = mul i32 %a, %b
+; CHECK: mul i32
+; CHECK-NOT: mul i32
+ %mul1 = mul i32 %a1, %b
+ %mul2 = mul i32 %a, %b1
+ %mul3 = mul i32 %a1, %b1
+
+ %v0 = call i32 @foo(i32 %mul0)
+ %v1 = call i32 @foo(i32 %mul1)
+ %v2 = call i32 @foo(i32 %mul2)
+ %v3 = call i32 @foo(i32 %mul3)
+
+ %1 = add i32 %v0, %v1
+ %2 = add i32 %1, %v2
+ %3 = add i32 %2, %v3
+ ret i32 %3
+}
+
+; The bump is a multiple of the stride.
+;
+; v0 = foo(b * s);
+; v1 = foo((b + 2) * s);
+; v2 = foo((b + 4) * s);
+; return v0 + v1 + v2;
+;
+; ==>
+;
+; mul0 = b * s;
+; v0 = foo(mul0);
+; bump = s * 2;
+; mul1 = mul0 + bump; // GVN ensures mul1 and mul2 use the same bump.
+; v1 = foo(mul1);
+; mul2 = mul1 + bump;
+; v2 = foo(mul2);
+; return v0 + v1 + v2;
+define i32 @slsr3(i32 %b, i32 %s) {
+; CHECK-LABEL: @slsr3(
+ %mul0 = mul i32 %b, %s
+; CHECK: mul i32
+ %v0 = call i32 @foo(i32 %mul0)
+
+ %b1 = add i32 %b, 2
+ %mul1 = mul i32 %b1, %s
+; CHECK: [[BUMP:%[a-zA-Z0-9]+]] = mul i32 %s, 2
+; CHECK: %mul1 = add i32 %mul0, [[BUMP]]
+ %v1 = call i32 @foo(i32 %mul1)
+
+ %b2 = add i32 %b, 4
+ %mul2 = mul i32 %b2, %s
+; CHECK: %mul2 = add i32 %mul1, [[BUMP]]
+ %v2 = call i32 @foo(i32 %mul2)
+
+ %1 = add i32 %v0, %v1
+ %2 = add i32 %1, %v2
+ ret i32 %2
+}
+
+; Do not rewrite a candidate if its potential basis does not dominate it.
+; v0 = 0;
+; if (cond)
+; v0 = foo(a * b);
+; v1 = foo((a + 1) * b);
+; return v0 + v1;
+define i32 @not_dominate(i1 %cond, i32 %a, i32 %b) {
+; CHECK-LABEL: @not_dominate(
+entry:
+ %a1 = add i32 %a, 1
+ br i1 %cond, label %then, label %merge
+
+then:
+ %mul0 = mul i32 %a, %b
+; CHECK: %mul0 = mul i32 %a, %b
+ %v0 = call i32 @foo(i32 %mul0)
+ br label %merge
+
+merge:
+ %v0.phi = phi i32 [ 0, %entry ], [ %mul0, %then ]
+ %mul1 = mul i32 %a1, %b
+; CHECK: %mul1 = mul i32 %a1, %b
+ %v1 = call i32 @foo(i32 %mul1)
+ %sum = add i32 %v0.phi, %v1
+ ret i32 %sum
+}