mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-08 21:32:39 +00:00
439d17ca9f
Summary: This patch enhances SLSR to handle another candidate form &B[i * S]. If we found two candidates S1: X = &B[i * S] S2: Y = &B[i' * S] and S1 dominates S2, we can replace S2 with Y = &X[(i' - i) * S] Test Plan: slsr-gep.ll X86/no-slsr.ll: verify that we do not run SLSR on GEPs that already fit into an addressing mode Reviewers: eliben, atrick, meheff, hfinkel Reviewed By: hfinkel Subscribers: sanjoy, llvm-commits Differential Revision: http://reviews.llvm.org/D7459 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233286 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
2.6 KiB
LLVM
122 lines
2.6 KiB
LLVM
; RUN: opt < %s -slsr -gvn -dce -S | FileCheck %s
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target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
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declare i32 @foo(i32 %a)
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define i32 @slsr1(i32 %b, i32 %s) {
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; CHECK-LABEL: @slsr1(
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; v0 = foo(b * s);
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%mul0 = mul i32 %b, %s
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; CHECK: mul i32
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; CHECK-NOT: mul i32
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%v0 = call i32 @foo(i32 %mul0)
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; v1 = foo((b + 1) * s);
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%b1 = add i32 %b, 1
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%mul1 = mul i32 %b1, %s
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%v1 = call i32 @foo(i32 %mul1)
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; v2 = foo((b + 2) * s);
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%b2 = add i32 %b, 2
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%mul2 = mul i32 %b2, %s
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%v2 = call i32 @foo(i32 %mul2)
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; return v0 + v1 + v2;
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%1 = add i32 %v0, %v1
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%2 = add i32 %1, %v2
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ret i32 %2
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}
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; v0 = foo(a * b)
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; v1 = foo((a + 1) * b)
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; v2 = foo(a * (b + 1))
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; v3 = foo((a + 1) * (b + 1))
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define i32 @slsr2(i32 %a, i32 %b) {
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; CHECK-LABEL: @slsr2(
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%a1 = add i32 %a, 1
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%b1 = add i32 %b, 1
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%mul0 = mul i32 %a, %b
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; CHECK: mul i32
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; CHECK-NOT: mul i32
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%mul1 = mul i32 %a1, %b
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%mul2 = mul i32 %a, %b1
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%mul3 = mul i32 %a1, %b1
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%v0 = call i32 @foo(i32 %mul0)
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%v1 = call i32 @foo(i32 %mul1)
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%v2 = call i32 @foo(i32 %mul2)
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%v3 = call i32 @foo(i32 %mul3)
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%1 = add i32 %v0, %v1
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%2 = add i32 %1, %v2
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%3 = add i32 %2, %v3
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ret i32 %3
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}
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; The bump is a multiple of the stride.
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;
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; v0 = foo(b * s);
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; v1 = foo((b + 2) * s);
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; v2 = foo((b + 4) * s);
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; return v0 + v1 + v2;
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;
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; ==>
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;
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; mul0 = b * s;
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; v0 = foo(mul0);
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; bump = s * 2;
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; mul1 = mul0 + bump; // GVN ensures mul1 and mul2 use the same bump.
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; v1 = foo(mul1);
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; mul2 = mul1 + bump;
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; v2 = foo(mul2);
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; return v0 + v1 + v2;
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define i32 @slsr3(i32 %b, i32 %s) {
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; CHECK-LABEL: @slsr3(
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%mul0 = mul i32 %b, %s
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; CHECK: mul i32
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%v0 = call i32 @foo(i32 %mul0)
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%b1 = add i32 %b, 2
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%mul1 = mul i32 %b1, %s
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; CHECK: [[BUMP:%[a-zA-Z0-9]+]] = mul i32 %s, 2
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; CHECK: %mul1 = add i32 %mul0, [[BUMP]]
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%v1 = call i32 @foo(i32 %mul1)
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%b2 = add i32 %b, 4
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%mul2 = mul i32 %b2, %s
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; CHECK: %mul2 = add i32 %mul1, [[BUMP]]
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%v2 = call i32 @foo(i32 %mul2)
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%1 = add i32 %v0, %v1
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%2 = add i32 %1, %v2
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ret i32 %2
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}
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; Do not rewrite a candidate if its potential basis does not dominate it.
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; v0 = 0;
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; if (cond)
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; v0 = foo(a * b);
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; v1 = foo((a + 1) * b);
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; return v0 + v1;
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define i32 @not_dominate(i1 %cond, i32 %a, i32 %b) {
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; CHECK-LABEL: @not_dominate(
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entry:
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%a1 = add i32 %a, 1
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br i1 %cond, label %then, label %merge
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then:
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%mul0 = mul i32 %a, %b
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; CHECK: %mul0 = mul i32 %a, %b
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%v0 = call i32 @foo(i32 %mul0)
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br label %merge
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merge:
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%v0.phi = phi i32 [ 0, %entry ], [ %mul0, %then ]
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%mul1 = mul i32 %a1, %b
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; CHECK: %mul1 = mul i32 %a1, %b
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%v1 = call i32 @foo(i32 %mul1)
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%sum = add i32 %v0.phi, %v1
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ret i32 %sum
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}
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