From 308bb86d48597254776f198efa221db5767db710 Mon Sep 17 00:00:00 2001
From: Cheng Shao <terrorjack@type.dance>
Date: Sun, 2 Jun 2024 20:15:46 +0000
Subject: [PATCH] compiler: emit NaturallyAligned when element type & index
type are the same width
This commit fixes a subtle mistake in alignmentFromTypes that used to
generate Unaligned when element type & index type are the same width.
Fixes #24930.
(cherry picked from commit 0cff083abb24701530974872b21cf897c9955a9a)
---
compiler/GHC/StgToCmm/Prim.hs | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/compiler/GHC/StgToCmm/Prim.hs b/compiler/GHC/StgToCmm/Prim.hs
index f3130cf6d26..eb3672445c6 100644
--- a/compiler/GHC/StgToCmm/Prim.hs
+++ b/compiler/GHC/StgToCmm/Prim.hs
@@ -2180,8 +2180,8 @@ alignmentFromTypes :: CmmType -- ^ element type
-> CmmType -- ^ index type
-> AlignmentSpec
alignmentFromTypes ty idx_ty
- | typeWidth ty < typeWidth idx_ty = NaturallyAligned
- | otherwise = Unaligned
+ | typeWidth ty <= typeWidth idx_ty = NaturallyAligned
+ | otherwise = Unaligned
doIndexOffAddrOp :: Maybe MachOp
-> CmmType
--
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