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Re: [Tinycc-devel] ARM codegen issue, possibly fixed already

From: grischka
Subject: Re: [Tinycc-devel] ARM codegen issue, possibly fixed already
Date: Sun, 14 Jul 2019 22:31:19 +0200
User-agent: Thunderbird (Windows/20090812)

Harald van Dijk wrote:
As that commit is an optimization, not a codegen fix, I would like to
ask whether the original issue is still present and just requires a more
complex test case to expose, or whether it has accidentally been fixed
by this commit.

No, I think this bug must exist since the very early days of
the project, on all 32-bit platforms.  This might fix it:

--- a/tccgen.c
+++ b/tccgen.c
@@ -1990,6 +1990,7 @@ static void gen_opl(int op)
         vtop[-1] = vtop[-2];
         vtop[-2] = tmp;
         /* stack: L1 L2 H1 H2 */
+        save_regs(4);
         /* compare high */
         op1 = op;
         /* when values are equal, we need to compare low words. since

-- gr

Thanks and keep up the good work!

Harald van Dijk

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