diff options
Diffstat (limited to 'compiler/GHC/Wasm')
| -rw-r--r-- | compiler/GHC/Wasm/ControlFlow/FromCmm.hs | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/compiler/GHC/Wasm/ControlFlow/FromCmm.hs b/compiler/GHC/Wasm/ControlFlow/FromCmm.hs index 0667345162..85eb8e534b 100644 --- a/compiler/GHC/Wasm/ControlFlow/FromCmm.hs +++ b/compiler/GHC/Wasm/ControlFlow/FromCmm.hs @@ -75,7 +75,7 @@ flowLeaving platform b = let (offset, target_labels) = switchTargetsToTable targets (lo, hi) = switchTargetsRange targets default_label = switchTargetsDefault targets - scrutinee = smartPlus platform e offset + scrutinee = smartExtend platform $ smartPlus platform e offset range = inclusiveInterval (lo+toInteger offset) (hi+toInteger offset) in Switch scrutinee range target_labels default_label CmmCall { cml_cont = Nothing, cml_target = e } -> TailCall e @@ -314,6 +314,14 @@ structuredControl platform txExpr txBlock g = nodeBody :: CmmBlock -> CmmActions nodeBody (BlockCC _first middle _last) = middle +-- | A CmmSwitch scrutinee may have any width, but a br_table operand +-- must be exactly word sized, hence the extension here. (#22871) +smartExtend :: Platform -> CmmExpr -> CmmExpr +smartExtend p e | w0 == w1 = e + | otherwise = CmmMachOp (MO_UU_Conv w0 w1) [e] + where + w0 = cmmExprWidth p e + w1 = wordWidth p smartPlus :: Platform -> CmmExpr -> Int -> CmmExpr smartPlus _ e 0 = e |