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Diffstat (limited to 'compiler/nativeGen/X86/CodeGen.hs')
| -rw-r--r-- | compiler/nativeGen/X86/CodeGen.hs | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/nativeGen/X86/CodeGen.hs b/compiler/nativeGen/X86/CodeGen.hs index 9f0af9429d..8bbc9f5dfc 100644 --- a/compiler/nativeGen/X86/CodeGen.hs +++ b/compiler/nativeGen/X86/CodeGen.hs @@ -1940,7 +1940,9 @@ genCCall dflags is32Bit (PrimTarget (MO_PopCnt width)) dest_regs@[dst] args@[src] bid = do sse4_2 <- sse4_2Enabled let platform = targetPlatform dflags - if sse4_2 + -- N.B. 64-bit population count is not supported on 32-bit platforms, even + -- with SSE4.2. Fall back to C implementation in this case + if sse4_2 && not (is32Bit && width == W64) then do code_src <- getAnyReg src src_r <- getNewRegNat format let dst_r = getRegisterReg platform (CmmLocal dst) |